Ash Barty stunned the sporting world on Wednesday by announcing her retirement from tennis, bowing out as the top-ranked player in the women's game.

The popular 25-year-old has not featured since winning her home grand slam at the Australian Open in January, becoming the first female Aussie singles champion of the tournament since Chris O'Neil in 1978.

Announcing the news on her Instagram page, Barty cited achieving a lifelong goal of winning Wimbledon last year as a primary factor behind her decision as well as being "spent physically".

But Barty is by no means the first sporting hero to retire at the top of their game. Below we take a look at some other examples of those who have exited as champions.

ALAIN PROST

The 1993 Formula One season was largely dominated by one man – Williams driver Alain Prost. The Frenchman had to battle hard with the iconic Ayrton Senna at the start of the campaign, with them each taking three wins from the first six races of the season. However, a run of four straight victories for Prost were followed by a string of retirements for Senna, ensuring a fourth world title that provided the ideal ending to a glittering career.

ALEX FERGUSON

One of the most successful managers in world football, Alex Ferguson began a 27-year stint at Manchester United after an excellent spell at Aberdeen. The Scot won 28 major trophies at Old Trafford, including 13 Premier League titles, five FA Cups and two Champions Leagues. His final trophy came with top-flight glory in 2012-13, and 17 days later he brought the curtain down.

PEYTON MANNING

Considered one of the greatest quarterbacks of all time, Peyton Manning won his first Super Bowl with the Indianapolis Colts in 2007 and, after an injury-blighted season that raised doubts about his ability aged 39, he added a second with the Denver Broncos in 2016, bowing out on the ultimate high.

RICHIE MCCAW, DAN CARTER

New Zealand became the first nation to successfully defend the Rugby World Cup trophy by beating Australia 34-17 in the final at Twickenham in 2015, adding to their success on home soil four years prior. It proved the end of the line for captain Richie McCaw, who was at the time the most capped player in rugby union with 148 appearances for the All Blacks, as well as mercurial fly-half Dan Carter. Ma'a Nonu, Conrad Smith and Kevin Mealamu were also among an influential contingent that opted to end their international careers.

PETE SAMPRAS

In defeating Andre Agassi in the final of the 2002 US Open, the same opponent he overcame to win his first grand slam 12 years prior, Pete Sampras secured his place among the greats in men's tennis. It was a then-record 14th major singles title for a male player for the American, a milestone that has since been surpassed by Roger Federer, Rafael Nadal and Novak Djokovic, but he did not compete again and announced his retirement almost one year later.

PHILIPP LAHM, MIROSLAV KLOSE

At 31 you still have a number of years ahead of you in football. However, after lifting the World Cup trophy with Germany in 2014, Philipp Lahm decided to call time on his international career and focus on club football with Bayern Munich. The versatile full-back made 113 appearances for his country and was joined by fellow centurions Per Mertesacker and Miroslav Klose – whose tally of 71 international strikes is a German record – in switching focus to domestic matters.

MARION BARTOLI

A first grand slam at Wimbledon in 2013 appeared to be the breakthrough moment for a 28-year-old Marion Bartoli, but reality proved very different. The Frenchwoman defeated Sabine Lisicki – who had overcome pre-tournament favourites Serena Williams and Agnieszka Radwanska – in the All England Club final, but announced her retirement during the Western and Southern Open just 40 days later due to persistent injuries. She attempted a comeback in 2018 but continued setbacks and injuries curtailed those plans.

NICO ROSBERG

Nico Rosberg had engaged in several intense battles with Lewis Hamilton before finally getting the better of his Mercedes team-mate to become Formula One world champion in the 2016 season. Still only 31, Rosberg had potentially several more years in F1 but the German instead opted to depart having reached the pinnacle of his sport.

Trae Young's return to Madison Square Garden was like a recurring nightmare for New York Knicks fans as the Atlanta Hawks prevailed 117-111.

Young, who became public enemy number one in New York when he erupted in the playoffs, eliminating the Knicks in the process, was spectacular again on Tuesday night.

He finished with a game-high 45 points (13-of-25 shooting, seven-of-15 from three) to go with eight assists, and was supported by a season-high 32 points (11-of-20 shooting, four-of-10 from three) from Bogdan Bogdanovic off the bench.

New York's R.J. Barrett played hard, but was ultimately inefficient, scoring 30 points on nine-of-25 shooting, going one-of-seven from long range and 11-of-17 from the free throw line.

The win pulls the Hawks' record even at 36-36, with last year's Eastern Conference finalists set for a play-in battle as they occupy the 10 seed.

Somehow, the opening race of the 2022 Formula One season in Bahrain last weekend managed to compare to the drama of 2021.

The first Ferrari one-two finish since Singapore in 2019, wheel-to-wheel duels between race winner Charles Leclerc and reigning world champion Max Verstappen, Mercedes achieving damage limitation with late DNFs for both Red Bull cars, new regulations creating the potential for a huge shakeup in the pecking order – there was a lot that went on at the Sakhir circuit on Sunday.

Ferrari are the biggest story coming into Jeddah this weekend, though.

There was enough to suggest Ferrari would compete with Red Bull and Mercedes coming out of winter testing, but just how competitive remained to be seen.

Despite Verstappen's failure to finish, Leclerc and Carlos Sainz dispelled any doubt in that regard with a maximum points haul. Something that arguably reinforces the point on Ferrari's strength was Sainz admitting he did not have the best of weekends.

"I mean in FP1, FP2 and FP3 I was very far behind, the most far that I've been ever in Ferrari and that's why even with a one-two that we scored I'm not entirely happy with the weekend, because as a Ferrari driver it's been my most difficult weekend," Sainz said.

"It just shows I need to put my head down, understand this car, understand where is Charles making the difference with his driving and the way he's approaching the corners and driving the tyres, also in the race."

For Leclerc, however, there's a belief that he finally has a car accordant to his talent to compete for the driver's title.

"Coming into this season, we surely knew we were going to be in a better position compared to the past two years but we didn't really know where, and now we see that we are actually in the mix to fight for a title, so it's amazing," he said.

Ferrari and Mercedes battle across the grid

The fascinating battle between a resurgent Ferrari and a previously dominant Mercedes will not just be fought between the factory teams this weekend in Saudi Arabia.

Amid new regulations, an interesting detail was the battle below the top teams. Ferrari power units made for five of the top ten positions in Sakhir, and four of the top six.

Meanwhile, apart from Lewis Hamilton and George Russell in the factory cars, Mercedes-powered cars made up the bottom six cars to have finished.

The Ferrari-powered Haas and Alfa Romeo have long been lagging at the back of the pack, but now look strong enough to take up the fight to Alpine, as well as the ambitious and Mercedes-powered McLaren and Aston Martin teams.

The midfield battle will be as fierce as the one at the front of the grid, while Saudi Arabia might shed some more light on the McLarens of Lando Norris and Daniel Ricciardo.

How quickly Red Bull bounce back?

Red Bull provided the bulk of the late drama in Sakhir, with Max Verstappen and Sergio Perez both failing to finish, due to fuel pump failure.

New fuel regulations for 2022 have meant higher engine temperatures on lower fuel, and Red Bull did not do enough low-fuel running during winter testing to encounter what they did in Sakhir.

Meanwhile, Mercedes and Ferrari were able to rectify these problems heading into the season start.

The question is, though the Red Bull is unquestionably strong in terms of race pace, how much will Verstappen have to play catch-up in the drivers' standings as the team sorts their fuel pump problem out?

CHAMPIONSHIP STANDINGS

Drivers

1. Charles Leclerc (Ferrari) 26
2. Carlos Sainz (Ferrari) 18
3. Lewis Hamilton (Mercedes) 15
4. George Russell (Mercedes) 12
5. Kevin Magnussen (Haas) 10

Constructors

1. Ferrari 44
2. Mercedes 27
3. Haas 10
4. Alfa Romeo 9
5. Alpine 8

Demar DeRozan was a man looking for answers after his Chicago Bulls were handed a demoralising 126-98 defeat at the hands of the reigning champion Milwaukee Bucks.

DeRozan, who at one stage this season was considered a real MVP candidate, had a sub-par 23 points on 23 field goal attempts in the loss, which moved the Bulls to a record of 3-9 in their past 12 games.

Three of the Bulls' past four games have now resulted in losses of at least 15 points against strong playoff contenders in the Utah Jazz (125-110) and the Phoenix Suns (129-102) before Tuesday's loss to Milwaukee.

Speaking to post-match media, DeRozan said it was evident what makes the Bucks a great team.

"Playing against the defending champs – seeing, feeling, understanding how hard they compete, and how well they execute," he said.

"Their physicality, everything that comes with it, it's how they got what they deserved last year, so that's what I take away from [this game].

"It's definitely not a talent issue at all – we've proven we are a great team – it's just execution, especially when you're playing against top-notch teams that understand the value of executing on both ends, and understand their assignments every time they stop out on the court.

"Those teams are always on a string, and we show it through spurts through a game, but the good teams that go far do it as close to 48 minutes as possible – not just a quarter, or half a quarter.

"You need to be as close to perfect through a 48-minute game as possible."

Derek Carr has spent his entire career trying to convince the Raiders, and indeed the wider NFL universe that he is good enough.

Few quarterbacks to have been as consistent as Carr have inspired such little confidence, his name rarely mentioned among the top players at the NFL's most important position despite him compiling some impressive numbers since arriving in the league.

Drafted in the second round in 2014, Carr has thrown for 31,700 yards in his career, the fourth-most in the league in that span. His 247 passing plays of 25 yards or more is a tally bettered by only four quarterbacks over the same timeframe.

Yet there are plenty of quarterbacks who excel at compiling stats and, for as tedious as the debate around whether wins should be considered a quarterback stat (they shouldn't) is, part of the reason for Carr's lack of recognition comparative to his contemporaries is that he has not been able to elevate the Raiders, either in Oakland or now Las Vegas, to a playoff win.

In efforts to end that wait, there have been reported dalliances with other quarterbacks by the Raiders, most notably with Tom Brady before he signed with the Tampa Bay Buccaneers in 2020.

Las Vegas has also previously been seen as a destination for Aaron Rodgers and Russell Wilson but, while the Raiders will get to see new Denver Broncos quarterback Wilson up close twice a season, they are firmly tied to Carr, and have this offseason done an excellent job of setting him up for success.

In Josh McDaniels, they have paired him with one of the league's premier offensive minds and, by spectacularly acquiring college team-mate Davante Adams in a blockbuster trade with the Green Bay Packers last week, the Raiders have given Carr the wide receiver many consider to be the class of the league.

With Adams added to an already exciting cast of offensive weapons, Carr has all the tools to definitively prove that, for the Raiders, he has always been the best man for the job.

Carr reaching peak performance

The timing of Carr's reunion with his former Fresno State team-mate Adams could hardly be better, as he is coming off arguably the finest season of his career.

Among quarterbacks with at least 200 pass attempts, Carr finished third in well-thrown percentage. Trailing only Joe Burrow and Ryan Tannehill, he delivered an accurate, well-thrown ball on 81.6 per cent of his passes.

None of the eight quarterbacks to average more air yards per attempt than Carr's 8.29 had a superior well-thrown percentage, his ability to blend ball placement and downfield upside further illustrated by his 67 completions of 20 yards or more in 2021. Brady (75) was the sole quarterback to end the season with more.

Carr achieved those feats despite tight end Darren Waller missing six games of the season and the Raiders losing wide receiver Henry Ruggs III after his November arrest.

He deserves great credit for continuing to thrive in a campaign that saw head coach Jon Gruden resign in disgrace, the Raiders playing the majority of the season under the interim leadership of Rich Bisaccia.

Now with McDaniels at the helm, Carr has a head coach to maximise his skill set and, with Adams joining Waller and Co. on offense, undoubtedly the most talented supporting cast of his career. 

A stacked receiver room

It is extremely difficult to overstate the importance of Adams' acquisition.

Over the past three seasons, only one player has racked up more receiving yards than Adams' 3,924. The man who represents his competition for the title of best receiver in the NFL, Cooper Kupp (4,082).

Adams' 34 receiving touchdowns in that span are second to Mike Evans (35), while no player has averaged more receiving yards per game than his 93.4 since 2019.

Producing a burn, which is when a receiver wins his matchup with a defender on a play where he is targeted, on 65.6 per cent of his targets, Adams was comfortably above the league average for receivers with at least 100 targets of 62. While his position as the NFL's top wideout may be up for debate, his status as one of its elite separators is not in question.

Only four receivers (min. 100 targets), one of which was Kupp (4), averaged more burn yards per route than Adams (3.5) in 2021.

Second (3.4) and first (3.9) in the same metric in 2019 and 2020, Adams' consistency in creating separation from coverage is unmatched, and he should benefit from playing in an offense stacked with bonafide weapons worthy of defensive attention.

Despite missing time, Waller still ended the 2021 season fifth among tight ends (min. 50 targets) in burn yards per target (11.91) and fourth in burn yards per route (3), his size, athleticism and ability to line up at every receiving position on the field making him a mismatch nightmare for defenses when at his best. Only two tight ends, Travis Kelce and Mark Andrews, have more receiving plays of 20 yards or more since 2019 than Waller (43).

Carr also has an excellent rapport with Hunter Renfrow. They combined for nine touchdowns in 2021, with three of those scores for the diminutive wideout coming on third down.

Yet the nickname 'Third and Renfrow' may have been inappropriately applied. Not because Renfrow isn't great on third down (18 of his 33 third-down targets last year went for first downs), but because team-mate Bryan Edwards might be even better.

Targeted just eight times on third down, six of those throws from Edwards to Carr were completed for a first down. Overall, Edwards had 76.5 per cent of his catches result in a first down last season, the second-best ratio in the NFL.

At 6ft 3in and 215 pounds, Edwards is a still under-utilised physically imposing ball-winner. Between Adams, Waller, Renfrow and Edwards, Carr now has a receiving corps to stack up with any other in the NFL.

Throw in a running back in Josh Jacobs who displayed his ability to overcome substandard blocking by averaging 3.38 yards per carry on runs where there was a disruption by a defender, the sixth-most in the NFL, in 2021, and Carr appears to have everything at his disposal to helm an explosive and dominant offense in 2022. That is presuming, of course, that Carr can re-establish his college connection with Adams.

But there is a risk any potential offensive surge could be cancelled out by the improvements made by the Raiders' rivals in what now looks a hellish AFC West.

Carr’s 'prove-it' year

The trade for Adams was just the latest move in a series of blockbusters from AFC West teams. In respective offseason efforts to end the divisional superiority of the Kansas City Chiefs, the Denver Broncos and Los Angeles Chargers each made significant additions to their rosters.

Denver hugely upgraded the quarterback position with a stunning trade for nine-time Pro Bowler Wilson, and the Chargers bolstered their defense with a deal to acquire edge rusher Khalil Mack while also signing cornerback J.C. Jackson and run-stuffing defensive lineman Sebastian Joseph-Day. 

In essence, the Raiders now have to compete with three elite quarterbacks in Patrick Mahomes, Wilson, and Justin Herbert, all of whom have seen their teams stack the deck around them.

Carr has previously gone blow for blow with both Mahomes and Herbert and won, most famously in Week 18 last season in the epic overtime game that almost ended in a tie that would have sent both the Raiders and Chargers to the playoffs.

However, with the Chargers pairing Mack with another fearsome pass rusher, Joey Bosa, and the Chiefs retaining Frank Clark on a defensive line that also features Chris Jones, Carr's hopes of getting the best of each of those signal-callers could be compromised by the play of his offensive line.

The Raiders' O-Line ranked 21st in pass block win rate last year, with Carr pressured 285 times, the third-most in the league behind Matt Ryan (319) and Josh Allen (312), and yet that area of the team has gone largely neglected in the offseason.

Great quarterbacks can overcome shortcomings at other positions and Carr did so last year in leading the Raiders to the playoffs. Though he may have improved help from a defense that looks better prepared to deal with the threat of opposing offenses after the hire of Patrick Graham as coordinator and the additions of veteran edge rusher Chandler Jones and cornerback Rock Ya-Sin, the reality is Carr will likely have to raise his game again if the Raiders are to enjoy postseason success.

The Raiders may look to use what draft capital they have left to improve on the offensive side of the trenches yet, regardless of any further moves to come, the onus is firmly on Carr. His is a career that has been spent trying to prove he belongs in the conversation as a top-tier quarterback. He built a compelling case last season but, flanked by offensive talent ready-made to help him keep pace with Mahomes, Herbert and Wilson, 2022 is the year in which he must definitively win the argument.

Ash Barty has announced a shock retirement from tennis at just 25.

The Australian world number one announced the decision via her Instagram feed.

"I am so thankful for everything this sport has given me and leave feeling proud and fulfilled," she said.

"Thank you to everyone who has supported me along the way, I'll always be grateful for the lifelong memories that we created together."

Barty has not played since winning the Australian Open final over Danielle Collins in January.

The stars will be out on Wednesday at Crypto.com Arena when the Philadelphia 76ers roll into town to take on the Los Angeles Lakers.

After sitting out the second leg of Monday's back-to-back against the Miami Heat, superstar duo Joel Embiid and James Harden should be back in the line-up for the 44-27 76ers as they jostle with the Milwaukee Bucks and Boston Celtics for the Eastern Conference two seed.

Meanwhile, the Lakers are fighting to keep their head above water, with their 31-41 record leaving them five games behind the eight seed Los Angeles Clippers as they prepare for the impending play-in tournament.

The Sixers are in the midst of a stylistic metamorphosis since the arrival of Harden at the All-Star break, completely re-shaping their offensive profile.

As was expected, the 76ers' free-throw rate (FTR) skyrocketed when it paired arguably the two greatest shooting-foul magnets of this generation.

Their 0.259 FTR – which means Philadelphia was shooting free throws on nearly 26 per cent of their possessions prior to Harden's arrival – was good for fourth in the NBA, with the Houston Rockets leading that category at 0.291.

While league-wide FTR is significantly up since the All-Star break, primarily due to it being artificially low to start the season as referees cracked down on players milking free throws, the 76ers have taken it to the extreme, leading the league at 0.374 following Harden's arrival – with only Philly and the New York Knicks (0.363) above third-placed Denver's 0.310.

No team has posted a FTR higher than 0.374 since Harden and Dwight Howard's 2013-14 Houston Rockets (0.386)

To say the 76ers have relied on free throws to sustain their scoring production is an understatement – since the trade, their 41.4 points in the paint per 100 possessions is the worst in the league, all while the offense revolves around a seven-foot-two behemoth in Embiid.

As has been the case with Harden's teams, specifically during his tenure in Houston, his offenses will live and die with free throws and three-pointers, with the 76ers upping their long-range attempts from 31.7 per 100 possessions to 35.6, moving from 26th in the league up to 11th.

It is irrefutable that Harden has changed this offense but, while Philadelphia's offensive efficiency has increased from 111 points per 100 possessions up to 115.4, their attack remains the 14th-best as league-wide efficiency is up across the board due to shooting fouls increasing and teams finding their rhythm.

On the other side, the Lakers are learning to live without injured centrepiece Anthony Davis, and the numbers have not been pretty on both ends.

Lacking a true interior presence since the All-Star break, the Lakers' FTR has plummeted from eighth in the league (0.251) to 26th (0.239), and their once-vaunted defense has become one of the league's worst.

As well as being 27th in overall defensive efficiency since the All-Star break, the Lakers are the league's second-worst team when it comes to allowing points in the paint.

So what happens when a movable object – the Lakers' paint defence – meets a stoppable force – Philadelphia's paint scoring?
 

PIVOTAL PERFORMERS 

Philadelphia 76ers – Joel Embiid

While Harden is a former MVP, Embiid is the favourite for this year's award, and his level of play is usually the deciding factor in whether the 76ers win or lose.

In wins this season, Embiid is averaging 31.7 points and 4.6 assists on 51 per cent shooting from the field, with those numbers dropping to 25.9 points and 3.7 assists on 43 per cent shooting in losses.

Los Angeles Lakers – LeBron James

Simply put, since the All-Star break, the Lakers only win when James dominates.

In that period, the Lakers have a record of 4-9 when James plays, with the four-time champion averaging 45 points, 9.3 rebounds and seven assists in the four wins.

KEY BATTLE – Who wants to run?

A glaring weakness of both teams since the All-Star break has been transition defense, with the Lakers dead last, allowing 18.7 fastbreak points per 100 possessions.

The 76ers have not been much better, coming in at 28th, allowing 16.6 per 100 possessions.

Philadelphia have been criticised for being slow, while the Lakers have been criticised for being old, but which team is going to take advantage?

The Lakers appear more equipped to play an up-tempo style, coming in at fifth in the NBA in fastbreak points per game (14.9), and it is worth noting that no player has more fastbreak dunks this season than LeBron James' 36.

HEAD-TO-HEAD

The 76ers won this season's only meeting, coming away with a 105-87 home win in a January game where Anthony Davis played, and played well for the Lakers in the critical absence of James.

Philadelphia won both meetings in the 2020-21 season, with the Lakers' last triumph coming on March 3, 2020.

Shelby Rogers continued her recent good form as she won an all-American clash with Amanda Anisimova in the first round of the Miami Open.

Rogers beat 10th seed Jelena Ostapenko en route to the third round at Indian Wells, where she lost in three sets to last year's US Open finalist Leylah Fernandez.

Both Rogers and Anisimova have experience of going into the second week of a grand slam, yet it was the more experienced Rogers who had the edge in South Florida, prevailing 3-6 6-0 6-3 in a stirring comeback.

Speaking on-court after the win, Rogers highlighted the challenge Anisimova poses when she is in form.

"[Anisimova] can come out and dictate play like nobody else when she is on fire, it's hard to do anything," she said.

"I felt like I had to counter that a little bit better. I was a little passive in the first, just running side to side.

"She played incredible. I'm just really happy I closed it out because I knew she was going to raise her level again at the end."

Round two will see a reunion between Rogers and Ostapenko, while Simona Halep, a two-time semi-finalist in Miami, will face Australia's Daria Saville.

Saville, formerly Daria Gavrilova, was ranked as high as 20 back in 2017, but had surgery on her Achilles last February.

A run to the last 16 at Indian Wells, including a top-10 win over Ons Jabeur, delivered a reminder of her quality and she will have the chance to claim another big-name scalp after beating Greet Minnen 7-5 6-3.

Elsewhere in the first round, there were wins for Marta Kostyuk, Magda Linette and Ekaterina Alexandrova.

Kaia Kanepi booked a second-round meeting with Sara Sorribes Tormo, while Heather Watson ended her six-year losing streak in Miami and will next face 15th seed Elina Svitolina.

The Miami Dolphins have signed Pro Bowl left tackle Terron Armstead to a five-year contract.

According to multiple reports, the Dolphins are giving Armstead a contract worth up to $87.5million, including $43.37m guaranteed.

Former New Orleans Saints star Armstead was considered by many to be among the top free agents on the market and fills a huge hole for a Dolphins offensive line that struggled significantly last season.

The Dolphins ranked last in the NFL in pass block win rate in 2021, per Stats Perform data.

Armstead should significantly improve their performance in that regard.

The three-time Pro Bowler missed nine games through injury last season but was one of the premier pass-blocking tackles in the league when healthy.

Among tackles with at least 100 pass-block matchups, Armstead ranked third with a stunt-adjusted pass-block win rate of 91.93 per cent.

His addition figures to be a pivotal one to the Dolphins' revamped offense under new head coach Mike McDaniel.

Free agency has also seen the Dolphins add left guard Connor Williams, wide receiver Cedrick Wilson, running backs Chase Edmonds and Raheem Mostert and fullback Alec Ingold. 

The Dolphins ended last season 29th in yards per play on offense (4.76) as they finished with a 9-8 record that was not enough to prevent Brian Flores from being fired as head coach.

Lewis Hamilton hopes he can continue to use his position within Formula One to push for greater diversity, saying such an achievement would be "more rewarding than any championship".

The Mercedes driver has won a joint-record seven world titles across his career, tied only with Michael Schumacher, and is widely regarded as one of the greatest in the sport's history.

Yet he has commanded just as much attention for his off-track activities in recent years, with the Briton leading anti-racism and pro-LGBTQ demonstrations within F1.

Speaking ahead of this weekend's Saudi Arabian Grand Prix – where he protested against anti-LGBTQ laws last year – Hamilton revealed he hopes to thrive in continuing to push for broader change.

"That's my role here I think to continue to hold those conversations, sit with Stefano [Domenicali] and say what are you doing and how can we work together?" the 37-year-old told Sky Sports.

"It goes back to bringing people on the journey rather than calling people out and unfortunately it takes a lot of yapping, but I think people seem more keen to be on the journey together and they empathise more with it and say yes, we can do a better job.

"I've got this platform and I am able to apply pressure in an uncomfortable way sometimes, but also it is a real opportunity to spark that change and that for me is more rewarding than any championship.

"My goal is that in the next five, 10 years you're looking back at the sport and I am watching TV, hopefully with my kids, and they see young women engineers and mechanics and they'll know there is an opportunity."

Having lost the 2021 F1 World Championship to Red Bull's Max Verstappen in controversial circumstances, Hamilton was denied a record-breaking eighth title.

But while winning honours remains a motivation for Hamilton, he feels such feats do not move the needle on the matters he wishes to help solve.

"I think as I started getting older, I started thinking I am winning these championships but what does it really mean?" he added.

"I realised that these championships are very rewarding personally, but they're not changing anything.

"You have another credit to your name, but it doesn't change the world, it doesn't change the fact we still have wars, we still have racial injustice.

"There are still people being abuse, there are all sorts of things out there, so what are we going to use this medium for, what are we going to use this platform for?

"I guess I really discovered my purpose – it's not just being a racing driver."

Za'Darius Smith has agreed a three-year deal with the Minnesota Vikings, according to reports.

The 29-year-old became a free agent after being released by the Green Bay Packers, and has now signed on with their NFC North rivals.

Reports suggest Smith's contract in Minnesota will have a base value of $42million, and potentially be worth up to $47m with incentives.

He had been expected to return to the Baltimore Ravens last week – whom he left for Green Bay in 2019 – supposedly agreeing to a four-year, $35m deal, but later pulled out.

In the days following Smith's apparent signing, both Von Miller and Chandler Jones – who are several years older than Smith – signed contracts with the Buffalo Bills and Las Vegas Raiders respectively, worth nearly double the annual salary of the deal offered by the Ravens.

The versatile edge rusher recorded 18.5 sacks in four seasons in Baltimore after he was drafted in the fourth round in 2015.

He then racked up 26 sacks across his first two years in Green Bay, helping them to back-to-back NFC Championship Game appearances.

However, a back injury limited him to just one regular-season appearance in 2021. Smith returned for the Packers' Divisional Round matchup with the San Francisco 49ers, but could not prevent a 13-10 defeat.

The Buffalo Bills have brought in running back Duke Johnson and wide receiver Jamison Crowder.

AFC East winners the Bills, who have been rated as the early Super Bowl favourites for 2022, continue to be active in free agency.

Having previously brought in star pass-rusher Von Miller, they added Johnson after missing out on the signing of J.D. McKissic to the Washington Commanders.

Pass-catching RB Johnson signed a one-year deal which has now been confirmed by his agents.

He has spent time with the Houston Texans and Miami Dolphins in recent seasons but is best known for a four-year stint with the Cleveland Browns to start his NFL career.

Crowder, meanwhile, has been productive when healthy over recent seasons despite playing for the struggling New York Jets in the same division as the Bills.

The wideout has reportedly signed a one-year deal worth up to $4million, helping to fill the void left by Cole Beasley's recent release.

Crowder racked up 188 catches over the last three seasons despite missing nine games through injury.

Elsewhere, Buffalo's rivals for AFC supremacy the Kansas City Chiefs have signed wide receiver Corey Coleman.

A former first-round pick with the Browns, Coleman has not caught a pass since 2018, but the Chiefs have opted to take a flyer on the Baylor product, who was not on an active roster last season.

Fresh from their dramatic moves at the quarterback position, the Atlanta Falcons have remained active.

As well as confirming their previously reported re-signing of offensive weapon Cordarrelle Patterson, they added free agent pass rusher Lorenzo Carter, formerly of the New York Giants, on a one-year contract.