Lewis Hamilton may be in search of a third Australian Grand Prix on Sunday, but Mercedes team principal Toto Wolff warned not to expect a "magic fix" amid a slow start to the season.

Mercedes have fallen well short of early leaders Ferrari, who hold a 40-point advantage over Red Bull in the constructors' championship after the opening two races in Bahrain and Saudi Arabia.

Hamilton managed to finish third in Bahrain in the season opener despite ongoing questions following a series of design changes by his team to comply with new regulations for the 2022 season.

However, Hamilton succumbed to his first performance-related Q1 elimination since 2009 in Jeddah as Mercedes failed to make the top five on the grid for the first time since the 2013 Italian Grand Prix.

Wolff was honest in his assessment ahead of the next race in Melbourne, with Mercedes aiming to rectify their issues with the W13 'porpoising' – bouncing at high speed – and not racing at the optimum height.

"We are in a learning race and the first two weekends have shown we still have plenty to learn," he said on Thursday.

"At the moment, our track performance is not meeting our own expectations, but everyone at Brackley and Brixworth is focused on understanding the problems and finding the right solutions.

"There won’t be a magic fix for the next race weekend. But we're pushing to steadily bring gains over the upcoming races, to hopefully move us closer to the front of the pack.

"Until then, we need to maximise each opportunity and make the most of the package we have."

Both Hamilton and George Russell played their part in the W13 development, and Wolff appears unworried by the upcoming challenges with his driving pair to call upon.

"Lewis and George are making an important contribution to the overall effort," he continued. 

"Providing feedback, spending time in the simulator and working together to help push us forward.

"So, there are various challenges ahead of us but that's something we relish, and is when a team really shows its true spirit."

Patrick Mouratoglou, the long-time coach of Serena Williams, has confirmed he will now work with Simona Halep.

Mouratoglou began coaching Williams in 2012 and has guided the former world number one to 10 grand slam titles and a further six major finals.

However, the last of those triumphs came in 2017, with Williams still one major success shy of matching Margaret Court's long-standing record of 24.

Williams reached the semi-final of last year's Australian Open, losing to Naomi Osaka, before subsequently going out in the last 16 at Roland Garros.

But the 40-year-old has not featured since retiring due to an injury in the first round to Aliaksandra Sasnovich at Wimbledon and is now ranked as the world number 246.

And it does not appear as though Williams will be making a return to the WTA Tour soon, with Mouratoglou explaining that, at least in the short term, he will be coaching former world number one Halep.

"Today, I am starting a new chapter in my coaching career: I am now the full-time coach of Simona Halep," Mouratoglou tweeted on Thursday.

"In the last eight months, I realised how much I missed coaching. It is the passion of my life, and I still feel like I have so much to give.

"Simona came to the Mouratoglou Academy before Indian Wells for a training block. I swung by at a few of her practices, watched her train.

"At the end of the week, she asked me if I was available to coach her. I have the highest respect for her but it was out of the question at the time.

"A few weeks later. I had a conversation with Serena, and the door opened for me, at least short term, to work with someone else.

"I will keep you updated on what's coming next soon."

World number 20 Halep endured an injury-hit 2020 and 2021, and split with long-time coach Darren Cahill in September of last year. The Romanian has won two grand slam titles, triumphing at Roland Garros in 2018 and Wimbledon the following season.

She has reached three other major finals and enjoyed a strong start to 2022, triumphing at the Melbourne Summer Set 1 prior to the Australian Open, in which she reached the round of 16.

Runs to the semi-finals at the Dubai Tennis Championship and Indian Wells Open have followed, though the 30-year-old will be hoping Mouratoglou can help her recapture the form she showed to end 2017 and 2018 on top of the WTA rankings.

Tiger Woods was greeted with thunderstorms that caused a delay to play on day one at the Masters, where the American superstar was making a shock return to competition.

The scheduled start at 08:00 local time in Georgia (13:00 BST) was moved back by half an hour due to the inclement weather on Thursday.

Lightning strikes were observed locally during the night, leading organisers to shift back the schedule.

Woods, the 15-time major winner who triumphed at the Masters for a fifth time three years ago, is returning to golf 14 months after a major car crash in California which he has admitted he was lucky to survive.

He suffered major leg and foot injuries but has tested his body against the hilly major championship course over the past week and was listed as a late-morning starter, with a rescheduled tee time of 11:04 local time (16:04 BST) as he prepared to play with South African Louis Oosthuizen and Chile's Joaquin Niemann.

Ferrari star Charles Leclerc insisted rivals Red Bull hold the advantage heading into the Australian Grand Prix in Melbourne.

Leclerc's Scuderia have opened up a 40-point lead in the constructors' championship after two races, with the Monegasque driver and Red Bull's Max Verstappen claiming one win apiece across Bahrain and Saudi Arabia.

Ferrari pair Leclerc and Carlos Sainz are also first and second in the drivers' championship, but the former is expecting a tough challenge at the redeveloped Albert Park in Melbourne.

Formula One returns to Australia for the first time in two years, with the track modified to make it much faster than it used to be, which Leclerc feels will not work in Ferrari's favour.

"Overall the track characteristics here are not fitting very well with our [car], but everything is to play for," Leclerc said.

"I still think we will be in the mix – it will still be very close."

Leclerc boasts a 12-point lead over team-mate Sainz in the drivers' standings, having secured victory in Bahrain and second in Jeddah, and reigning champion Verstappen sits a further eight back.

But Leclerc reiterated that Red Bull will be the favourites on Sunday, given Verstappen's team appear the leaders on straights and Albert Park has removed a chicane while widening some corners.

"I think the old one would have suited us better," he added. "But it is the way it is and we will try to maximise everything as always, and hopefully Imola [after the Australian GP] will be a track that suits us a little bit better.

"It is not like it is going to be a big gap. If we do the perfect job, everything is possible."

Sainz echoed Leclerc's sentiments as he labelled Red Bull the favourites.

"Our car has been strong in all the circuits we have been to so far, but it's true in Jeddah, with more straight-line [speed], the Red Bull looked like the better car and [had] the better balance in terms of top speed and corner speed," Sainz said. 

"So, given how long the straights have become here, maybe they are a bit more up for it. But I think we can still do a good job."

While Ferrari appear concerned with the modifications in Melbourne, DRS strategy is also expected to play a significant role in the third race if the opening two are anything to go by.

Leclerc has attempted to utilise the DRS overtaking aid in both those races, letting Verstappen through before the detection points and then benefiting in overtaking zones, and he expects a similar tactical battle to follow again.

"We have seen in the past two races this strategy with DRS, and I am pretty sure we will see it even more here, because basically all the straights have a DRS zone, so overtaking will be a thing and clever racing can make a big difference here," he said.

Matteo Berrettini could miss the French Open after the world number six was forced to withdraw from three tournaments as he continues to recover from minor hand surgery.

The Italian progressed to the Wimbledon final in 2021 and started the new season in encouraging fashion as he reached the Australian Open semi-finals, where he was well-beaten by eventual winner Rafael Nadal.

However, the 25-year-old has seemingly struggled from then on, with his next best performance coming in Rio – where he made the last eight – as he limped to a 9-6 record so far in 2022.

Further difficulties followed for Berrettini after he sustained an injury to his right hand late in March, forcing him to withdraw from the Miami Open before undergoing a "minor operation".

Berrettini provided another update on Instagram on Thursday, revealing he would not feature at the Monte-Carlo Masters, scheduled to start later this week, or the Madrid Open and Italian Open at the start of May.

The latter tournament in Rome begins just two weeks before the second grand slam of the year, leading to concerns that Berrettini may not feature at Roland Garros.

"UPDATE – following advice from the medical experts, my team and I have decided that it is crucial I do not put time pressure on my recovery process," he posted.

"We have therefore decided I should withdraw from the Monte-Carlo, Madrid and Rome tournaments to ensure I give myself the proper amount of time to return at my highest level.

"Withdrawing from these events, particularly Rome, was an extremely tough decision, however it is the right one to ensure many more years of competing at the highest level for the biggest trophies.

"Thanks very much for all the support. My recovery process is on track and I look forward to seeing you on-court soon."

Los Angeles Clippers wing Norman Powell feels his team are a threat in this year's playoffs – and Kawhi Leonard is looking strong.

Powell returned in style from two months on the sideline, scoring 24 points off the bench in the Clippers' 113-109 home win against the Phoenix Suns.

The 2019 champion with the Toronto Raptors suffered a broken foot in an early-February matchup against the Dallas Mavericks but showed no ill effects as he scored six-of-10 field-goal attempts, including going three-of-four from long range, and nine-of-10 from the free throw line.

Despite Clippers star Leonard missing the entire season so far with his recovery from a torn ACL and co-star Paul George only playing 29 games, Los Angeles are somehow 40-40 through 80 games and locked into the Western Conference eight seed.

Speaking with ESPN, Powell said it was a successful return from injury.

"The foot has been feeling good," he said. "The medical staff wanted to give me a few test games, stay-ready games leading up to the game tonight, seeing how it would respond to the extra workload. 

"It was feeling great. Tonight it feels great... I thought it was a good first game after being out for two months."

Powell went on to speak about the threat his side poses in a postseason setting.

"I think we can be really dangerous," he said. "Paul George drives a lot of attention on the floor, and when me and him and [Marcus Morris Sr.] and Reggie [Jackson] are all on the floor, we've got so many weapons.

"I just think we have weapons at every position, and I can take the pressure off those guys if need be, being a ball-handler as well. 

"It reminds me of that 2019 [Raptors] team. We were able to do that with Pascal [Siakam], with Marc [Gasol], with Serge [Ibaka], Kawhi, Danny [Green], Kyle [Lowry], me, Fred [VanVleet]. 

"What we had, we were able to give them different lineups throughout the course of the game, whatever the game is dictating, to go big, defense, with length."

While George's return from a long-term elbow injury has already given the Clippers a punchers' chance, Powell gave an update on Leonard, who would completely change the team's expectations if he was to declare himself fit for the playoffs.

"I've just [been] asking [Leonard] how he feels, where his head is at," he said.

"He feels good. Seeing him being able to work out, put some shots up, things like that, I think his rehab is trending in the right direction. 

"As you know, and everybody else, you are not going to get too much information out of Kawhi. They keep everything [under] wraps, but I know he is feeling good and his rehab is progressing."

Sam Darnold has insisted he can still be a starting quarterback in the NFL, despite the Carolina Panthers' seeming distrust.

Darnold was traded to the Panthers from the New York Jets ahead of the 2021 season, yet Carolina are potentially eyeing a quarterback in the NFL Draft and have not ruled out another return for Cam Newton.

The 24-year-old Darnold played 12 times for Carolina last season (11 starts), recording 2,527 passing yards for nine touchdowns, along with five rushing scores.

Over the past two seasons, Darnold has thrown for only 18 touchdowns but 24 interceptions, while being sacked 70 times.

But despite the Panthers perhaps wanting to upgrade, Darnold is sure of his own ability.

He told the Bussin' with the Boys podcast: "It truly is like whatever happens happens, because at the end of the day, it's out of my control, and I know that.

"I have enough security in myself to where I can be like: 'I know I'm a good quarterback. I know I can be a good quarterback in this league. I've proved it.'

"I know there's a team, if something happens, that would want me."

Darnold was drafted by the Jets as the third overall pick in 2018 but struggled to live up to his billing in New York.

He completed just 57.7 per cent of his pass attempts in his rookie season before improving slightly in a 2019 campaign in which he threw 19 TD passes and 13 interceptions.

A tough final season with the Jets was followed by Darnold being traded to the Panthers for three draft picks, including a second-round selection in 2022.

Last year, form and fitness continued to evade Darnold, who has never played more than 13 games in a season. His passer rating of 71.9 represented a miserable career low.

He did at least beat out the returning Newton for the starting job, but the former MVP could yet sign for the Panthers again.

Christian Yelich understands the pressure that comes with being paid as a franchise player heading into the first season of his seven-year, $188million contract extension with the Milwaukee Brewers.

Yelich, 30, has now spent four years with the Brewers after arriving from the Miami Marlins and was a revelation with his new club.

In his first year in Milwaukee, Yelich catapulted himself into the conversation of the game's elite players, winning NL MVP in 2018 and finishing second in the award in 2019, leading the National League in batting average in both seasons.

His incredible performance was rewarded with a juicy new contract – which officially kicks in this season – but since signing, he has regressed significantly.

The 2020 and 2021 season were the two worst of Yelich's career, but he now says he knew the entire contract would not be all "smooth sailing".

"I understand what comes with [the big contract]," he told The Athletic. "I understand that if you don't play well, people are going to be p***ed. Like, I get it. 

"It's part of sports. It's part of what we do, especially when you sign a deal like that. There's no getting around that, and I'm very aware of that.

"I know that I am paid at a level where you need to produce and things are expected of you, and that's because of past performances in the game. That's how it works... so there's no shying away from it. 

"I knew that contract is over a long time, so I didn't really assume that it was going to be smooth sailing all the time."

Yelich admitted the game felt "pretty easy at times" during his peak years but stressed his career is evidence plenty can change from year to year.

"That's the thing – every year is its own year," he said. "Just because you did well or did poorly the year before, it doesn't mean anything going into the next year or the year after that. Every year is its own thing – nothing carries over. 

"There's different factors every year that go into whatever's going on for players and teams.

"The game is constantly adjusting and things constantly are changing. You have to do that as well or the game is going to kick your a**."

The Brewers kick off their season on the road against the Chicago Cubs on Opening Day.

There will be plenty to play for when the Boston Celtics arrive at Fiserv Forum to take on the Milwaukee Bucks on Thursday.

Heading into the game, the Celtics (50-30) occupy the Eastern Conference two seed, while the Bucks (49-30) are a half-game back in third, holding the tie-breaker over the Philadelphia 76ers (49-30) in fourth.

Since the All-Star break, no team has a better winning percentage than the Celtics (16-4), while Milwaukee are fifth over that period (13-6); but while the reigning champion Bucks find their feet, Boston have gone to a new level.

For the season, the Celtics are number one in defensive efficiency, as new head coach Ime Udoka's switching system has maximised the physical gifts of defensive stalwarts Marcus Smart and Robert Williams III.

At this point, Boston's defense is a given, but post-All-Star break, they have also had the number one offense in the league, and are putting a gap on the rest of the field. Over that time period, the closest team to Boston's 122.2 points per 100 possessions have been the Minnesota Timberwolves, 2.7 points per 100 possessions behind at 119.5.

For context, that 2.7-point gap is greater than the 2.6-point margin between the Timberwolves and the 11th-placed 76ers (116.9) for the same period, and Boston's 12.9 net-rating since All-Star weekend is a number generally reserved for some of the greatest regular season teams in league history.

However, the team right behind the Timberwolves on the list, in third place, are the Bucks, and it is no hot streak as they boast the fifth-best offensive efficiency over the whole year.

These teams are both serious contenders to represent the Eastern Conference in the NBA Finals – but they go about it in very different ways.

Primarily, that has a lot to do with the Celtics' switching defensive system.

The Celtics 'switch' screens – meaning instead of fighting over or under the screening player to recover back to your assignment, the player guarding the screener takes on the assignment of guarding the ball-handler, while the ball-handler's defender takes responsibility for the screener and his next movements.

The Bucks, on the other hand, play 'drop coverage', which means their on-ball defender tries to force the ball-handler on a predictable path around the screen, while the screener's defender peels off into a help position, with the aim of forcing the ball-handler to pull up for a mid-range shot with their defender contesting from behind.

Both systems are formed on sound logic. In switching schemes, the idea is to eliminate as much dribble penetration as possible by keeping the ball-handler in front on the perimeter, while trusting the smaller guard to be able to deny the screener an easy catch in the paint.

Drop coverage, on the other hand, forces teams to consistently attempt mid-range jump shots, which are statistically the least valuable shot in the game.

In theory, Boston's switching defense should perform well against Giannis Antetokounmpo, as the Bucks' two-time MVP thrives at attacking the rim, while Milwaukee should be able to bait Jayson Tatum and Jaylen Brown into mid-range jump shots that can go cold for extended stretches.

But the numbers show it may not be that simple.

Boston allow the second-fewest amount of points in the paint per game, and while Antetokounmpo lives at the rim, the Bucks actually come in last in the league with their percentage of points scored in the paint.

While that may indicate that the Celtics' defense is playing right into how the Bucks like to play, Boston also allow the second-lowest three-point percentage in the league.

It poses an interesting question about Boston – is their defense truly so good that teams can not score inside the key or from long range, or is their defense the top-ranked in the league because their opponents just keep missing threes?

Opposing three-point percentage can be a messy stat due to general shooting luck, and Boston allow opponents to get up a league-average amount of attempts, so if they are due for some regression to the mean, it means they are due to be on the wrong end of some hot shooting nights.

Boston's defense also allows the lowest amount of opposition assists per game, but Milwaukee are third-last in assist percentage, so how much are the Bucks actually trying to do the things the Celtics are built to stop?

Milwaukee play at the fifth-highest pace in the league, while Boston play at the fifth-lowest – all signs point to the fact that something has to give, and whoever can play the game at their tempo may just hold the keys.

PIVOTAL PERFORMERS

Boston Celtics – Marcus Smart

Marcus Smart is not the best scorer on the Celtics, or the best ball-handler, but he excels in the areas that have made this Boston team great during the second half of this season.

He is the bookmakers' favourite to win Defensive Player of the Year due to his ability to switch off of point guards and bang bodies down low against the bigs, unlocking the true upside of a switching system as post players regularly fail to take advantage of their significant height advantage.

The Bucks are a big team, so for the Celtics defense to rise to the occasion once again against a true contender, Smart will need to hang with Jrue Holiday on the perimeter, as well as keep Antetokounmpo out of the lane.

Milwaukee Bucks – Brook Lopez

Antetokounmpo is Milwaukee's best and most valuable player. However, the centrepiece of the Bucks' drop coverage is Brook Lopez.

Lopez will be the biggest player, with the longest arms, for either team, and Milwaukee's entire defensive scheme will revolve around forcing players to take and make shots over his outstretched arms.

He also has the size, and the underrated post game, to make life miserable for whichever undersized guard gets caught in screening actions and needs to switch onto the seven-footer.

Smart will be able to hold up if he establishes good early position, but if the Bucks can get Derrick White or Payton Pritchard involved in the switch, it could be a long night inside for Boston's defense.

KEY BATTLES – Who can get the most 'easy' points?

In a game that will likely resemble a playoff atmosphere, the winning team may simply be the side who make life easiest on themselves.

Fast-break points and free throws limit the amount of possessions a team needs to grind their way through a set half-court defense, and provide the easiest avenues to uncontested points.

Milwaukee rank as the eighth-best team at getting to the free-throw line, and fourth-best at denying their opposition free throws, while Boston are 21st at getting to the line.

As mentioned, Boston like to play at a methodical pace, ranking 20th in fast-break points, while Milwaukee have the fifth-best transition defense in the league.

HEAD-TO-HEAD

These two sides have met three times this season – all before the All-Star break.

Boston won the first two home fixtures – including an overtime win where Dennis Schroeder scored a game-high 38 points, before being traded to the Houston Rockets – while Milwaukee won the last meeting, and the only one at Fiserv Forum, 117-113.

The 2022 French Open will provide Jo-Wilfried Tsonga with a final opportunity to shine in front of a home crowd after the 36-year-old confirmed his impending retirement.

Tsonga has suffered with injuries over recent seasons and has managed just two ATP Tour match wins so far in 2022.

The Frenchman reached a high ranking of world number five and finished as runner-up at the 2008 Australian Open.

He never won a grand slam but did reach five more major semi-finals. Tsonga has collected 18 singles titles on the ATP Tour, including two Masters 1000 crowns in Paris (2008) and Toronto (2014). His last triumph came in 2019 in Metz.

"It is with great emotion that I announce today my decision to stop my professional career at the next French Open," Tsonga wrote on social media.

"So many incredible moments, so much joy shared with a public that gave me a lot. Hoping for one last thrill with you!"

In a video accompanying his announcement, Tsonga said: "The goal is to be myself, to be Jo-Wilfried Tsonga the tennis player.

"I hope that I will stay in shape before and be able to be who I have always been at this tournament.

"I have always set myself high goals to try to get what I can. For me, this will be the opportunity to do it one last time."

Yannick Noah (69.6 per cent) is the only Frenchman to have a higher winning percentage in tour-level matches than Tsonga (66.5).

Adam Silver is concerned by what he sees as "a trend" of the NBA's best players spending too much time on the sideline.

NBA commissioner Silver was speaking at a news conference following a two-day meeting with the league's board of governors.

Last year's NBA MVP Nikola Jokic was one of 11 players to play every game in the shortened 72-game 2020-21 regular season.

But only five players are on course to complete the full 82 games this year – and none of them could be considered superstars.

While Jokic has still played a good number in 73, MVP rivals Joel Embiid and Giannis Antetokounmpo have been limited to 66 and 65 games respectively.

Stephen Curry has played in 64, Luka Doncic and James Harden in 63, LeBron James in 56, Kevin Durant in 53 and Kyrie Irving, chiefly due to the vaccine protocol that was in place in New York for much of the season, in 27.

Harden (37.2 minutes), James (also 37.2), Irving (37.5) and Durant (37.1) have at least seen plenty of time on the floor when they have been available, although the Brooklyn Nets and Los Angeles Lakers have spent much of the season hovering around the play-in line.

While Silver acknowledged injuries were a factor, he suggested this sort of motivation was key to seeing the best of the league's stars.

Antetokounmpo (32.9 this year) has long played limited minutes in the regular season, while Kawhi Leonard – prior to the injury that has kept him out of this season – was allowed regular periods of rest with the Toronto Raptors and Los Angeles Clippers in order to prepare for the playoffs.

"The greater concern to me is a trend of star players not participating in a full complement of games," Silver said.

"I think that's something we, together with the Players Association, need to address. I'm not standing here saying I have a great solution.

"Part of the issue is injuries. One of the things we have focused on at the league office and we had begun to spend a lot of time on pre-pandemic [is]: are there things we can do in terms of sharing information, resources around the league to improve best practices, rehabilitation?

"The other way we can get at it, in terms of player participation, is creating other incentives.

"The play-in tournament, I thought, was a beginning of creating renewed incentives for teams to remain competitive and be fighting for playoff position. It might be through in-season tournaments and changes in format where we can get at it."

Brooklyn Nets superstar Kevin Durant was excited about the state of his club's local rivalry against the New York Knicks after going into Madison Square Garden and leaving with a 110-98 comeback win.

After conceding 67 points in the first half, the Nets clamped things down defensively after the break, giving up just 31 points in the last two quarters, including a dominant 38-16 final period.

Durant was spectacular, scoring 32 points (11-of-22 shooting) with 10 rebounds and 11 assists, while Patty Mills caught fire off the bench, hitting five three-pointers after struggling recently with his shot.

R.J. Barrett was the main man for the Knicks, scoring 23 points with seven rebounds and seven assists, but shot just seven-of-27 from the field as he struggled down the stretch.

Speaking to post-game media, Durant said he felt the animosity in the building towards himself and his team, and that he knows why.

"We know how much Knicks fans don't like us," he said. "Especially now, in this era of the Nets, with [Kyrie and I] not choosing the Knicks [in free agency]. 

"It definitely adds something to the rivalry… imagine the tweets I've been getting since I decided to come to the Nets, from Knicks fans. They're still pi**** off about the stuff I say, and the little jabs here and there.

"But like I said, it's always love in the streets when I see Knicks fans, it's always love at the games, but it's a good rivalry to be a part of.

"Everybody who steps in our building will realize how big these games are – it felt like a home game to us the last two times in [Madison Square] Garden, and it feels like a home game for the Knicks when they come to Barclays.

"It's good to be a part of this, it's a fun rivalry, and hopefully it continues to build, and we get more and more animosity between the fan bases. It will be good for the game."

Top-seeded Aryna Sabalenka won for the first time since late February, defeating Alison Riske 7-6 (7-3) 6-4 at the Charleston Open on Wednesday.

Losing her opening matches at the sunshine double of Miami and Indian Wells, after only taking five games off Iga Swiatek at the quarter-final in Doha, the world number five improved her head-to-head record with Riske to 5-0.

Sabalenka by no means cruised to victory, though, failing to close the match out at 5-2 in the second set. Riske had four break points to level at 5-5, but the 23-year-old powered through when she needed to, eventually closing out after an hour and 49 minutes.

Second-seeded Paula Badosa of Spain and ninth-seeded American Madison Keys also advanced to the third round at Charleston, with respective wins over Anna Bondar and Ulrikke Eikeri.

Badosa, who made the semi-finals in Charleston last year, overcame a mid-match rain delay to eventually win in an hour and 35 minutes.

Jessica Pegula continued her positive run of form after making the semi-finals in Miami, accounting for Jasmine Paolini with a 6-2 6-1 victory.

Other seeded winners included Belinda Bencic and Alize Cornet, while Elina Rybakina, Ajla Tomljanovic and Shuai Zhang were among seeds who lost on Wednesday.

The weather in South Carolina continued to be a problem at the first WTA clay-court event this season, however, as the match between Ons Jabeur and Emma Navarro was suspended due to heavy rain.

Meanwhile at the Copa Colsanitas in Bogota, Rebecca Peterson was the only seeded player in action on Wednesday, and lost 6-1 6-4 to Germany's Tatjana Maria.