Iga Swiatek is growing in confidence by the day after she blew Cristina Bucsa to reach the fourth round of the Australian Open.

The world number one ruthlessly dispatched the Spanish qualifier 6-0 6-1 in just 55 minutes on Margaret Court Arena on Friday.

Swiatek won the French Open for a second time last year before claiming her first US Open title and the 21-year-old is the favourite to be crowned champion at Melbourne Park.

Reflecting on her progress through the draw so far, the Pole believes she is making great strides in her quest for a fourth grand slam triumph.

"I feel I'm more and more confident since day one here," she said. "I feel like I've done so much work to feel more confident, more relaxed on court.

"I'm pretty happy I did it because it's just a little bit easier. Whe you actually play those matches, you can feel the rhythm a little bit more.

"I don't feel like the tournament is going to start now, because first rounds are always challenging.

"I'm trying to treat every match separately. I always try to have the same mindset. I can just say that I feel more confident because I'm played a couple of matches here."

Swiatek will do battle with Elena Rybakina in the fourth round and will ensure she does her homework before facing the Wimbledon champion.

"Tactically, I'm not prepared yet. We played an exhibition in Dubai, [but] it's hard kind of to take a lot from that match," she said.

"I'm pretty sure my coach is going to be ready to give me some tips. We'll see [but] I'm not really thinking about that today."

Tournament director Craig Tiley has no plans to change the Australian Open schedule despite a 4am finish for Andy Murray and Thanasi Kokkinakis.

Murray stormed back from two sets down to beat Australian Kokkinakis 4-6 6-7 (4-7) 7-6 (7-5) 6-3 7-5 early in the early hours of Friday morning on Margaret Court Arena.

The three-time grand slam champion sealed an incredible victory in a second-round thriller that took five hours and 45 minutes to settle.

That was the longest match in Brit Murray's career and the 4.05am finish was the third-latest in the history of the sport.

Murray made his feelings over having to play at that time of day very clear, but Tiley did not see an alternative option.

"You would expect from 7pm to 12pm (the evening session) in that five-hour window, you would get two matches," Tiley said. "We also have to protect the matches. If you just put one match at night and there’s an injury, you don't have anything for fans or broadcasters.

"At this point there is no need to alter the schedule. We always look at it when we do the debrief like we do every year, we've had long matches before, at this point we've got to fit the matches into the 14 days so you don't have many options."

Murray vented his frustration at the chair umpire during the match and stated after his victory that he did not see the logic in playing so late.

"I don't know who it's beneficial for," Murray said. "We come here after the match and that's what the discussion is, rather than it being like, 'epic Murray-Kokkinakis match'. It ends in a bit of a farce.

"Amazingly people stayed until the end, and I really appreciate people doing that and creating an atmosphere for us. Some people obviously need to work the following day and everything.

"But if my child was a ball kid for a tournament and they're coming home at five in the morning, as a parent, I'm snapping at that. It's not beneficial for them. It's not beneficial for the umpires, the officials. I don't think it's amazing for the fans. It's not good for the players.

"We talk about it all the time, and it's been spoken about for years. But when you start the night matches late and have conditions like that, these things are going to happen."

Philadelphia 76ers coach Doc Rivers did not hide his frustration with certain elements of his team's play despite beating the Portland Trail Blazers 105-95 on Thursday.

The Sixers made it four wins on the bounce, all of which have been on the road, with Joel Embiid and James Harden playing key roles.

Embiid's 32 points made it the seventh game in a row he has reached at least 30, while Harden posted a triple-double of 16 points, 14 assists and 10 rebounds.

The Sixers looked to be coasting at one stage, finding themselves 26 points to the good, but the Trail Blazers made life a little trickier towards the end.

Rivers' team got the job done as they improved to 29-16 in the East, behind only the Boston Celtic and Milwaukee Bucks, though he was certainly not completely satisfied.

He was particularly irritated by the Sixers' poor handling of the Trail Blazers' trapping, and he was not impressed by how spread out his players were.

Asked how they coped with respect to trapping, Rivers said: "Poorly, but we also took advantage of some of it as well.

"I didn't think trapping was that hard, our spacing was horrendous, and we're great at spacing most nights, but tonight we kept leaving two guys on the other end.

"I'm hoarse from yelling, just getting one to cut through and we basically didn't do it. We got away with three or four more than I thought they could've had. But that's easy to fix."

In letting Portland back into the contest somewhat in the second half, Rivers felt there was a hint of complacency in the Sixers' performance.

As such, he surmised they are still not at a stage where they can consider themselves anything more than a "good" team.

He added: "There's no lesson, the lesson is execute. I just thought we didn't.

"You get leads sometimes and they're hard, NBA leads shrink quickly and then you get complacent, and I think we did a little bit of that.

"But in that, one thing I like is we kept playing defense, and that's a good sign.

"I think we're good, and I think we can be really, really good. But we have work to do.

"We can't expect to come in and just show up and win, we have to go out and do something about it."

Nevertheless, with the likes of Embiid and Harden in their arsenal, the Sixers have the kind of star quality that can drag them through the mud even when they are not at their optimal level as a unit.

That is not lost on Embiid.

"I think from the beginning it was easy," he said of linking up with Harden, who joined from the Brooklyn Nets last February.

"When you've got two guys with high basketball IQs, you can figure it out everything easy.

"So, it's all about just playing off of each other. We've been doing a wonderful job of doing that."

Jacque Vaughn will continue challenging Ben Simmons to answer his responsibilities after another disappointing outing saw him ejected in the Brooklyn Nets' loss to the Phoenix Suns.

Simmons was sent from the game for arguing with referee Eric Lewis having played just 18 minutes, as the Nets continued to struggle in the injury-enforced absence of Kevin Durant in a 117-112 loss – their fourth defeat in a row.

In his previous outing, Simmons had put up his first triple-double for the Nets in Tuesday's defeat to the San Antonio Spurs, but a season of ups-and-downs went on in Phoenix, where he spent most of the game contending with foul trouble.

Averaging just 7.5 points, 6.8 rebounds and 6.3 assists this campaign, the Nets need more from a player who has All-Star pedigree.

Vaughn is determined to spark more consistency in Simmons, who arrived last February as part of a blockbuster trade that sent James Harden to the Philadelphia 76ers.

"We need him to be productive, and that is without the fouls," Vaughn said. "That is helping us rebound the basketball. That is playing with poise and composure. That is pushing the pace for us.

"So unfortunately when you're a really good basketball player, your list is long and so are the responsibilities. And hopefully, we'll continue to ask of those things and challenge him and challenge this group to be able to answer those long lists."

For his part, Simmons felt the decisions given against him lacked consistency.

"I don't want to say nothing because I ain't trying to get another fine," he said.

"I think if you're going to call the game like that, then you've got to be consistent. I think it's been like that all year. If you're going to call a moving back, then you've got to be consistent [on] both ends. Same with the holding."

Team-mate Kyrie Irving remains confident in Simmons' ability to contribute to the Nets' cause but urged him to control his emotions going forward as the season reaches an important stretch towards the playoffs.

"Same thing we've been doing is just give him a ton of confidence," Irving said when asked how the team can help Simmons get going. 

"But also knowing that he's mature enough to handle himself. He's a very talented basketball player, and we could name all the superlatives, but we need him in the game and I think he understands that, especially during this stretch we're going to need him in every game.

"I've gotten ejected before only once in my career. Tempers flare, you disagree with the refs, but the big picture is the most important thing, and on this team, I think Ben realises that. But tonight, just his emotions got the best of him."

The latest defeat leaves the Nets fourth in the Eastern Conference with a 27-17 record.

Jaylen Brown likened the intensity in the Boston Celtics' workmanlike overtime 121-118 victory over the Golden State Warriors to a playoff game.

The Warriors had not returned to TD Garden since winning Game 6 of last season's NBA Finals to secure the championship.

Much like in that series, the Celtics were littered with turnovers (17 in total resulted in 24 points for the visitors) and struggled to fire on all cylinders offensively.

This time, though, Boston found a way to win. Trailing by 11 points in the second half, the Celtics fought back and Brown tied the game via a three-pointer with 18 seconds remaining and then, having gained an eight-point advantage, held on after a sloppy ending to overtime.

"That felt like a playoff game," Brown said.

"Their intensity, their force where they came, that's a game I'm sure they wanted to win. We were down, what, five to seven [points] in the fourth quarter, four, five minutes left. 

"To be able to have poise to battle back, that shows a lot of growth. We're taking steps in the right direction."

Jayson Tatum had a career-high 19 rebounds to go with 34 points and six assists but was also guilty of a couple of poor turnovers.

He too, though, felt the Celtics showed the sort of requisite desire to win when the team is not particularly playing their best basketball.

"You're going to need games like this," Tatum said. 

"There's going to be a handful of playoff games where you don't necessarily shoot the ball well, maybe even on the road – under 40 per cent, 73 per cent from the free-throw line, 17 turnovers – and still find a way to win.

"I think that just shows the depth of our team, that on a below-average night for us, we can still find a way to win. That's all that matters at the end of the night. Did you win or did you lose?"

Interim Celtics coach Joe Mazzulla felt the nature of the victory showed how the team have grown since losing the Finals.

"For us, we've talked about poise and physicality," he said. 

"Everybody asks, what did we learn [from losing in the Finals]? What have we learned? And I think what we've learned is it takes a mindset in order to be successful. And it takes a mindset to be a really, really good team in the NBA. And you can't be inconsistent with that.

"I think even though you play really, really well and we win, we're still going to have some of those moments. Yeah, we had some turnovers, we had some kind of plays where it's just kind of like, 'That shouldn't happen'. But that's going to happen.

"It's about just the habits that we're growing as far as our mindset, our poise, our physicality, our ability to execute, our ability to handle the chaos of an NBA game."

The Celtics sit top of the Eastern Conference with a league-best 34-12 record, while the Warriors are ninth and 22-23 in the West.

World number one Iga Swiatek made an emphatic statement with a 54-minute rout of Spanish qualifier Cristina Bucsa to seal her progression to the Australian Open fourth round on Friday.

Swiatek dropped only six points in a 22-minute first set, before completing a 6-0 6-1 demolition over her 25-year-old opponent at Margaret Court Arena.

The Pole led 6-0 5-0, prompting a crowd member to shout "open the bakery", before Bucsa held her serve to avoid a dreaded double bagel.

Swiatek's victory sets up a fourth-round clash with 2022 Wimbledon champion Elena Rybakina, as the Pole chases her fourth major triumph, including the French Open and US Open crowns last year.

The 21-year-old completely outclassed her opponent, winning 82 per cent of serve points, along with 65 per cent on return, including 71 per cent on Bucsa's second serve. The Spaniard only won 19 of 71 points for the match.

Despite an unconvincing first-serve percentage of 59 per cent, Swiatek never offered up a break point, hitting 15 winners throughout the lopsided contest.

Swiatek has not dropped a set in her three matches at the tournament, giving up only six games in her past two matches.

Data slam: Swiatek demolition falls short of Barty mark

Swiatek's swift victory coincidentally came on the afternoon after Andy Murray and Thanasi Kokkinakis battled until 4am local time in a five-hour-and-50-minute epic in the men's singles.

However, the Pole's 54-minute win was not as brief as last year's champion Ash Barty who disposed of Danka Kovinic 6-0 6-0 in 44 minutes at the 2021 Australian Open.

WINNERS/UNFORCED ERRORS

Swiatek – 15/6
Bucsa – 4/21

ACES/DOUBLE FAULTS

Swiatek – 3/0
Bucsa – 1/3

BREAK POINTS WON

Swiatek – 5/10
Bucsa – 0/0

Seventh seed Coco Gauff cruised safely into the Australian Open fourth round with a straight-sets victory over compatriot Bernarda Pera on Friday.

Gauff, 18, triumphed 6-3 6-2 in one hour and 35 minutes in a competitive contest where Pera, 10 years the teenager's senior, put up a fight with her powerful left-sided forehand a feature in their first-ever meeting.

But Gauff made fewer unforced errors and produced seven aces to help her clinch a fourth-round meeting with 17th seed Jelena Ostapenko.

"Today was a tough match," Gauff said during his on-court post-match interview. "Bernarda hit the ball really hard. I was really just trying to hang in there and take the ground when I could.

"Last season she had a long match streak so I knew she'd be a tough player to beat. But I'm happy to be through to the second week."

The 2022 French Open finalist broke Pera in the fourth game and secured the opening frame inside 48 minutes.

Gauff went two breaks up in the second set, leading 4-1, but Pera offered some resistance with a break back on a double fault from the teenager. But Gauff responded to progress, converting her fourth match point.

Data Slam: Gauff maintains hot start to 2023

Gauff, who knocked off 2021 US Open champion Emma Raducanu in the second round, continued her perfect start to the calendar year, having triumphed at the Auckland Open earlier this month. Gauff won five matches in Auckland, including the final 6-1 6-1 over Rebeka Masarova.

ACES/DOUBLE FAULTS

Pera – 1/7
Gauff – 7/3

WINNERS/UNFORCED ERRORS

Pera – 24/40
Gauff – 23/29

BREAK POINTS WON

Pera – 1/5
Gauff – 4/16

Jayson Tatum grabbed a career-high 19 rebounds during the Boston Celtics' 121-118 overtime victory against the Golden State Warriors on Thursday.

It was a gritty all-round performance from Tatum as he also finished with 34 points, six assists and three steals, imposing his will on the game despite shooting an inefficient nine-of-27 from the field and committing seven turnovers.

Like Tatum, his All-Star team-mate Jaylen Brown also shot just 33 per cent from the field (six-of-18), but veteran center Al Horford picked up the slack, scoring 20 points on eight-of-13 shooting while adding 10 rebounds and three blocks.

As was a theme on the night, Warriors superstar Stephen Curry struggled from the field, shooting nine-of-25 for his 29 points, supplementing his outing with seven assists, four steals, four rebounds and two blocks. Klay Thompson (eight-of-16) and Jordan Poole (10-of-25) chipped in 24 points each.

With the win, the Celtics improved their league-leading record to 34-12, while the Warriors fell under .500 at 22-23, including a horrific 5-17 record on the road.

Russell leads late Timberwolves comeback

Minnesota Timberwolves guard D'Angelo Russell nearly scored as many points as the entire Toronto Raptors team in the fourth quarter of a 128-126 comeback win.

Russell had 16 in the last period – including 14 in a row for the Timberwolves – while the Raptors could only muster 17 points, allowing the home side to claw back from what was a 14-point margin with 10 minutes remaining.

The former All-Star finished with 25 points on eight-of-15 shooting, adding six assists and two steals, while role-player Kyle Anderson continued to flourish in his expanded minutes with 20 points (eight-of-nine), 10 rebounds and six assists.

Suns snap losing run with Nets win

In the battle of two short-handed teams, the Phoenix Suns ended their three-game losing streak in a nail-biting 117-112 victory over the Brooklyn Nets.

The Suns were up by 24 at one point, but Kyrie Irving got hot in the fourth quarter to finish with 30 points, seven rebounds and seven assists, for the Nets who were without Kevin Durant.

Deandre Ayton stepped up for Phoenix, missing Devin Booker and Chris Paul, with 24 points and 14 rebounds, while Mikal Bridges added 28. Cam Johnson added 19 points on his return from injury.

Two-time grand slam runner-up Ons Jabeur says it is "time to recover and get healthier" after her shock second-round elimination from the Australian Open on Thursday.

The Tunisian second seed committed 50 unforced errors as she was bundled out of the opening major of the 2023 season, losing 6-1 5-7 6-1 loss to Marketa Vondrousova.

The defeat comes after the 28-year-old's outstanding 2022 season where she reached the finals of both the Wimbledon Championships and the US Open.

Cameras spotted Jabeur dropping to her knees in apparent despair in the halls of Rod Laver Arena after leaving the court following her loss to Vondrousova.

The Tunisian skipped the mandatory post-match press conference, but opened up on her emotion and condition on Instagram on Friday.

"Despite the health issues, I will keep fighting and come back stronger and stronger," Jabeur posted on Instagram. "Time to recover and get healthier."

Four NFL franchises have made offensive or defensive coordinator changes following their Wild Card Game exits.

The Miami Dolphins have dismissed defensive coordinator Josh Boyer after four seasons with the franchise, despite having the league's fourth-best run defense.

The Dolphins also were ranked 21st in defensive expected points added, 22nd in sacks per pass attempt and 24th in points allowed per game and third-down percentage.

The Tampa Bay Buccaneers have fired offensive coordinator Byron Leftwich after four seasons, as part of an overhaul by head coach Todd Bowles, with eight other coaches departing.

The Bucs finished the 2022 regular season with an 8-9 record, but ranked 25th in offense, averaging 18.4 points per game despite the presence of seven-time Super Bowl champion Tom Brady.

Brady is set to become an unrestricted free agent this offseason and is weighing up his future, but Leftwich's departure is unlikely to significantly impact his decision.

The Minnesota Vikings fired defensive coordinator Ed Donatell, which came as no surprise after finishing the season ranked 28th in points allowed (25.1) and 31st in yards allowed (388.7).

Greg Roman announced he would step down as the Baltimore Ravens offensive coordinator despite having one year remaining on his deal following pressure from fans and players.

Four NFL franchises have made offensive or defensive coordinator changes following their Wild Card Game exits.

The Tampa Bay Buccaneers have fired offensive coordinator Byron Leftwich after four seasons, as part of an overhaul by head coach Todd Bowles, with eight other coaches departing.

The Bucs finished the 2022 regular season with an 8-9 record, but ranked 25th in offense, averaging 18.4 points per game despite the presence of seven-time Super Bowl champion Tom Brady.

Brady is set to become an unrestricted free agent this offseason and is weighing up his future, but Leftwich's departure is unlikely to significantly impact his decision.

The Miami Dolphins have dismissed defensive coordinator Josh Boyer after four seasons with the franchise, despite having the league's fourth-best run defense.

The Dolphins also were ranked 21st in defensive expected points added, 22nd in sacks per pass attempt and 24th in points allowed per game and third-down percentage.

The Minnesota Vikings fired defensive coordinator Ed Donatell, which came as no surprise after finishing the season ranked 28th in points allowed (25.1) and 31st in yards allowed (388.7).

Greg Roman announced he would step down as the Baltimore Ravens offensive coordinator despite having one year remaining on his deal following pressure from fans and players.

Davis Thompson produced back-to-back eagles on his way to a two-stroke lead after opening with a 10-under 62 at the American Express in California on Thursday.

The unheralded 23-year-old American leads the way from a stacked field that includes 10 of the top 20 in the world.

Thompson set up his career-low round by shooting an eight-under-par 28 on his front nine, including eagles on both the fifth and sixth holes at the La Quinta Country Club, which is one of three courses being used as players also spread across the PGA West's Stadium Course and Nicklaus Tournament Course.

The American's performance tied the lowest front-nine score on the course, having made six of seven fairways and eight of nine greens.

Behind Thompson is a group of five players, including former world number one Jon Rahm who carded nine birdies and a bogey in his round of 64 on La Quinta. Rahm is tied with Sam Burns, Tyler Duncan, Matti Schmid and Taylor Montgomery at eight under.

Burns might have been outright second if not for a bogey on the 18th on the Stadium Course, having carded seven birdies on his front nine. The American made nine consecutive one-putts.

Nine players are a further stroke back at seven under after the first round, including Tokyo Olympics gold medalist and two-time major runner-up Xander Schauffele, who also shot an eagle on the fifth.

Among the pre-tournament favourites, Scottie Scheffler and Patrick Cantlay both shot four under on La Quinta, while Will Zalatoris managed three under on the Nicklaus Tournament Course. Tony Finau and Tom Kim carded rounds of three under at La Quinta.

The Baltimore Ravens are confident they can reach a long-term deal with franchise quarterback Lamar Jackson amid a contract stand-off.

The Ravens' 2022 season ended with Sunday's 24-17 Wild Card loss to the Cincinnati Bengals, re-opening discussion on the 2018 NFL MVP's future after shelving talks during the regular season.

There has been an awkward relationship between Jackson and the franchise after the Ravens opted against handing the 26-year-old a new five-year contract in 2022, with the QB playing out the fifth-year option of his rookie deal this season.

Ravens general manager Eric DeCosta and head coach John Harbaugh told reporters on Thursday that they are determined to keep Jackson.

"Lamar Jackson is our quarterback," Harbaugh said. "He's been our quarterback. Everything we've done in terms of building our offense and our team, putting people around him, is based around this young man, his talent, his ability and his competitiveness.

"I'll have my fingers crossed and my toes crossed, I'll be saying prayers, I've every faith it's going to get done. Eric wants him here, I want him here, [owner] Steve [Bisciotti] wants him here and Lamar wants to be here. It's going to work out."

Jackson, who represents himself, wants a guaranteed-money deal while the Ravens are likely to place the franchise tag on him if no deal is completed by March to ensure he does not become an unrestricted free agent.

DeCosta added that he was in constant communication with Jackson and hopeful on completing a new deal.

"It certainly takes two to tango but I think Lamar and I have a great relationship," DeCosta said.

"We communicate quite often. We spent some time together today as a matter of fact. We've spoken throughout the season multiple times. These negotiations, they all happen differently.

"We'll communicate effectively, we'll be as fair as we can be. We'll try to hammer out a deal. Hopefully we can get to that point."

When asked if Jackson would be Baltimore's Week 1 starting QB next season, DeCosta added: "I don’t see any reason why he won't be."

The Ravens fired offensive coordinator Greg Roman on Thursday, with Jackson to have input in his replacement, in a sign they are moving forward in the assumption he will remain.

Harbaugh added that he had no concerns over Jackson's durability, despite being unable to finish the past two seasons due to injury.

"He's a very durable player," he said. "I know that people might take issue with that. But I don't believe that there's going to be a problem going forward because I know how hard he works."

Jackson started 12 games in the 2022 season, with a completion rate of 62.3 per cent for 17 touchdowns and seven interceptions, adding three rushing TDs and 764 yards on the ground.