Emma Raducanu knows she must "get stronger" after losing to Petra Martic in the third round of the Indian Wells Open.

Martic came from a set down to beat US Open champion Raducanu 6-7 (3-7) 6-4 7-5 on Sunday.

Teenager Raducanu has been troubled by a back injury and an issue with her hip.

The Brit says she was hampered at Indian Wells, but is confident she will be fit for the Miami Open next week.

"I think it's just part of not playing and having so much stop start and having five, six days to prepare for matches and then playing at that intensity,” she said.

"It was a tough one not being able to serve full out so I was having to work so hard just to hold.

"I've just got to get stronger. I've had it for the last few days, just a product of training hard and probably the last match was pretty intense too and it didn't settle down.

"When you are crossing your fingers to hold serve every time, it's tough. I couldn't really drive up and I was kind of struggling to turn and reach.

"The margins were so small. I should be good for Miami, for sure."

Andy Murray has expressed his sympathy for Naomi Osaka over the abuse she was subjected to at Indian Wells but says athletes must deal with it.

Osaka was reduced to tears as she crashed out of the Indian Wells Open with a 6-0 6-4 third-round defeat to 21st seed Veronika Kudermetova on Saturday.

A member of the crowd could be heard shouting "Naomi, you suck" after the four-time grand slam champion had been broken in the first game of the match.

Osaka approached the chair umpire to report the incident and held further discussions with the court supervisor after being insulted again.

Murray says there is no place for such conduct, but believes players must be able to ignore it.

He said: “It's a difficult one. I've often thought watching certain sports, I wouldn't say I've often seen it loads in tennis … but if I watch a football or a soccer match and a player's going to take throw-in or a corner kick and the crowd are just hurling insults at those individuals.

"I always think, how is that allowed? Like, you can't do that. If you're doing that to someone when you're walking down the street or in any other sort of work environment, that's obviously not tolerated.

"I've played in certain atmospheres as well myself in tennis, like Davis Cup atmospheres, away from home, especially where the atmosphere's intense, and sometimes things are said and it's not that comfortable.

"The people that come to watch, you want them to be there and supporting the players and not making it more difficult for them. I don't know, but it's also something that's always just kind of been part of sports as well."

He added: "If you go and watch a basketball match, for example, and a player's taking free throws, I would say like almost every basketball match I've been to one of the players has been heckled by the crowd as well

"While it's wrong for those individuals to be doing it, the athletes obviously have to kind of be used to that as well or be able to deal with that too, even though it's not pleasant.

"I feel for Naomi, that obviously it upset her a lot, but it’s always been something that's been part of sport, I guess, as well.

"You have to be prepared for that in some ways and be able to tolerate it because it does happen regularly across all sports."

Third seed Alexander Zverev has been knocked out of the Indian Wells Masters by Tommy Paul in his first game since his expulsion from last month's Mexican Open for unsportsmanlike conduct.

Unseeded American Paul triumphed over the German 6-2 4-6 7-6 (7-2) in two hours and 17 minutes, rallying back from a break down in the final set.

Paul hit less winners, 26-21 to Zverev but made less unforced errors 25-19, while his serve and volley game was a key feature.

"I played a really high level today," Paul said during his on-court post-game interview. "The last time I played him, I played well, I put pressure on him so I knew how i wanted to play so I came out and executed him well.

"I played well when it came down to the breaker, so I'm pretty happy with my performance."

Zverev had not played since being expelled in Acapulco after a stunning outburst where he struck his racquet on the umpire chair several times after a doubles defeat.

Ninth seed Felix Auger-Aliassime was a major casualty, going down to Dutchman Botic van de Zandschulp 7-6 (7-4) 6-7 (4-7) 6-3 in three hours and 15 minutes.

The Canadian had 36-27 winners but was let down by 43-26 unforced errors, along with converting only two of his 10 break points.

Van de Zandschulp had failed to take three match points in the second set but showed composure to finish the job in the third.

Wild card Andy Murray was also eliminated in the second round, blowing three set points in the first set before going down to 31st seed Alexander Bublik 7-6 (11-9) 6-3 in two hours and one minute.

Last year's Wimbledon runner-up and Italian sixth seed Matteo Berrettini needed more than two hours to get past world number 86 Holger Rune 6-3 4-6 6-4.

Seventh seed Andrey Rublev defeated Dominik Koepfer 7-5 6-4 to extend his win streak to 10 matches, while 11th seed Hubert Hurkacz beat Oscar Otte 6-3 3-6 6-3.

Other seeds to be eliminated were 22nd seed Aslan Karatsev who went down 7-6 (7-5) 6-4 to American Steve Johnson, while 24th seed Marin Cilic lost 6-7 (7-9) 6-3 7-6 (8-6) to Miomir Kecmanovic.

Two-time major winner Simona Halep secured a spot in the Indian Wells Open last 16 with a strong 6-3 6-4 victory over 16th seed Cori Gauff on Sunday.

Halep, who is aiming to rebuild her ranking in 2022 after an injury-hit second half of last year, was excellent with her return, particularly on Gauff's second serve to gain the edge.

The Romanian saved all four break points generated by Gauff, while she converted three of the nine break points that she created.

Halep, who started the year with victory at the Melbourne Summer Set 1 before a last-16 loss to Alize Cornet at the Australian Open, needed only one hour and 16 minutes to seal her progress.

She will next play Romanian compatriot Sorana Cirstea after the 26th seed won 5-7 6-1 6-0 against lucky loser Anna Kalinskaya.

Last year's US Open champion and British 11th seed Emma Raducanu was bundled out by Croatian world number 79 Petra Martic 6-7 (3-7) 6-4 7-5.

Raducanu had served for the match in the final set but the Croatian won the final three games. Martic triumphed in two hours and 46 minutes, reaching the last 16 at Indian Wells for the second time in her career.

Martic will face 28th seed Liudmila Samsonova who triumphed 6-4 7-6 (7-4) over Danka Kovinic.

Third seed Iga Swiatek came from a set down to win 6-7 (3-7) 6-2 6-1 over Clara Tauson in two hours and 18 minutes.

Swiatek has won seven straight matches and is unbeaten at WTA 1000 events this season, having triumphed in Doha last month.

The Pole will take on three-time major winner Angelique Kerber in the last 16 after the German won comfortably over Daria Kasatkina 6-2 6-1.

American 25th seed Madison Keys got past countrywoman Alison Riske 7-6 (7-4) 6-1, setting up a fourth-round meeting with British qualifier Harriet Dart who beat Kaia Kanepi in straight sets.

An emotional Naomi Osaka says being targeted by a heckling spectator during her loss to Veronika Kudermetova reminded of abuse the Williams sisters were subjected to at the Indian Wells Open.

Osaka was reduced to tears as she crashed out with a 6-0 6-4 third-round defeat to 21st seed Veronika Kudermetova at Indian Wells on Saturday.

A member of the crowd could be heard shouting "Naomi, you suck" after the four-time grand slam champion had been broken in the first game of the match.

Osaka approached the chair umpire to report the incident and held further discussions with the court supervisor after being insulted again.

Serena and Venus Williams were subjected to verbal abuse at the prestigious tournament in the Californian desert back in 2001.

The legendary siblings' father, Richard Williams, claimed he had been racially abused at Indian Wells, while Venus Williams said she "heard whatever he heard".

Former world number one Osaka said while trying to hold back the tears after her exit: "I've been heckled before and it didn't really bother me.

"But being heckled here... I've watched videos of Venus and Serena get heckled here and if you've never watched it, you should watch it.

"I don't know why, but it went into my head and got replayed a lot. I just want to say thank you and congratulations [to Kudermetova]." 

Serena Williams boycotted the competition for 14 years before making her Indian Wells return in 2015.

Stefanos Tsitsipas survived a big scare in his "crazy battle" with Jack Sock to reach the third round of the Indian Wells Masters.

The fifth seed was taken all the way to a third-set tie-break by Sock, which he trailed 5-3 before recovering to claim a 7-6 (7-5) 3-6 7-6 (7-5) victory in a gripping contest.

Sock, ranked 140 places below his opponent, put his strong forehand to good use to hold in a first set that went the distance but was undone by some unforced errors.

After responding brilliantly by taking the second set, after once again holding his serve, the American looked to be heading for defeat when 40-0 down at 5-6 in the third set.

However, he dug deep to force another tie-break and was within two points of a big victory, only for two more unforced errors to cost him a place in the last 32.

"It was a crazy battle; we both left everything out there," Tsitsipas said. "Jack played incredibly well at times but I was able to bring out the best in my game at the end. 

"I proved I could play aggressive tennis and stay calm at the same time."

Tsitsipas will now face another home hopeful in Jenson Brooksby, who saw off Karen Khachanov 6-0 6-3 earlier in the day.

Jannik Sinner battled to a 6-3 6-3 win over Laslo Djere elsewhere in Saturday's action, while Denis Shapovalov and defending champion Cameron Norrie also advanced.

Fabio Fognini withdrew from his meeting with Nikoloz Basilashvili, who now awaits Norrie in the next round.

Naomi Osaka was brought to tears by a heckling spectator during her Indian Wells Open match with Veronika Kudermetova before going on to lose 6-0 6-4.

The incident happened after Osaka had been broken by Kudermetova in the first game, with someone in attendance reported to have yelled "Naomi, you suck".

Four-time grand slam winner Osaka, competing in her first tournament since January's shock early Australian Open exit, appeared to ask the chair umpire to take action.

Osaka initially put that unneeded distraction behind her by taking the next point, but she wasted two break opportunities and Kudermetova successfully held to move 2-0 ahead.

The 24-year-old was in tears as she prepared to serve her next game and held further discussions with the court supervisor after going 3-0 down.

She could not recover and, after losing the first set 6-0, Osaka suffered the only break of serve in the seventh game of the second set to lose the contest fairly resoundingly. 

Kudermetova will now face Marie Bouzkova for a place in the last 16 after the Czech recovered to see off home hopeful Jessica Pegula 5-7 6-2 6-0.

Two-time champion Victoria Azarenka also made it through on Saturday with a 6-3 7-5 victory over lucky loser Astra Sharma, setting up a meeting with Elena Rybakina.

Leyla Fernandez saved four match points against Amanda Anisimova in a dramatic match that came to an end when the American retired through illness.

After losing the opener 6-2, Fernandez took the second set to a tie-break but felt unable to continue. Anisimova will meet Shelby Rogers in a rematch of last year's last-16 encounter.

Rafael Nadal offered his sympathy to Sebastian Korda after scraping past the 21-year-old, who considers his Indian Wells Masters opponent "my biggest idol".

Korda had trained with Nadal earlier this week before the draw paired the two together – an eagerly awaited encounter for the younger man.

Korda is such a big Nadal fan his cat is named after the Spaniard, but he caused some concern for the 21-time major champion and his other supporters on Saturday.

Having talked up the meeting, it looked as though the occasion might get the better of Korda as he quickly fell 4-0 down in the opener.

Nadal had not dropped a set since victory at the Australian Open – one of three tournaments he has entered this year and three tournaments he has won.

But that perfect 15-0 record suddenly came under threat in the second set, as Korda sought to prolong his dream match-up and stunned his hero 6-1.

Suddenly, Nadal was forced to face down one of his biggest fans in a decider and initially struggled badly, falling two breaks down, with Korda serving for the match at 5-2.

This time the nerves did get to Korda, who lost four games in a row before stopping the rot to reach a tie-break.

There, Korda did briefly hold a mini-break lead, but that was only as part of a sequence of five consecutive mini-breaks that took the match away from him, Nadal prevailing 6-2 1-6 7-6 (7-3).

"I feel very, very lucky today to be through, honestly," Nadal said afterwards.

Korda could at least enjoy his consolation prize: compliments from Nadal, who had won their only prior meeting en route to his 2020 French Open title.

"Sebastian was playing some fantastic tennis and I'm sorry for him," Nadal said. "He had chances, but that's tennis.

"He's very young, he has an amazing future. I wish him all the best."

Up next for Nadal is Dan Evans, whose compatriot Cameron Norrie – the defending Indian Wells champion – also advanced with a straight-sets win over Pedro Martinez.

Newly-minted world number one Daniil Medvedev said his win was "not as easy" as it appeared after beating Tomas Machac in straight sets at the Indian Wells Masters.

Medvedev beat his Czech opponent 6-3 6-2 in their second round match, his first since being told he cannot compete under the Russian flag following the invasion of Ukraine.

After saving a break point in the opening game, Medvedev settled quickly, breaking-to-love to go up 4-2 and securing the first set without conceding a point in his final two service games.

The 26-year-old effectively put the contest to bed when he broke Machac's serve in the opening game of the second set, later securing the double-break to sail to the finish line.

Speaking to the post-match media, Medvedev said it was far from a perfect performance, but was glad to come through unscathed.

"I think I was pretty consistent," he said. "If you look at the first set, it was pretty even. He made a few unforced errors and maybe some bad decisions in the crucial moments – that's how tennis is sometimes.

"The scoreline might be pretty effective, 6-3 6-2, but if you look at the points and the games, it was not as easy as it seems. 

Angelique Kerber and Maddison Keys each required three sets to reach the third round of the Indian Wells Open, while Coco Gauff held off Claire Liu to advance on Friday.

Number 15 seed Kerber was handed a banana skin tie of sorts against Zheng Qinwen and was made to work hard for her 6-2 5-7 6-4 victory against the rising Chinese star.

Zheng battled back with three breaks of serve in the second set to level up and led 4-1 in the decider, but her opponent dug deep to prevail in a time of two hours and 18 minutes.

Daria Kasatkina awaits Kerber – who had not previously won this calendar year – after the Russian beat Katie Volynets 6-4 4-6 7-5 earlier in the day.

Keys was also pushed all the way in her clash with Misaki Doi before coming out on top 6-4 3-6 6-1 to set up a meeting with Alison Riske in round three.

The Australian Open semi-finalist struggled in the second set after holding her serve throughout the first, though she had enough quality to see off her Japanese opponent.

Gauff had less trouble against fellow American Liu, advancing in a little over an hour to reach the third round, the stage in which she was eliminated on her debut here last year.

She will take on former world number one Simona Halep on Sunday, the day she turns 18, in a rematch of their last-16 showdown from Wimbledon three years ago.

Emma Raducanu and Iga Swiatek are among the others already through to the last 32 in California.

Alison Riske produced a breathtaking comeback to beat Garbine Muguruza at the Indian Wells Open, turning around an apparent lost cause after losing the first nine games of the match.

Muguruza, who won the WTA Finals title at the end of last season, was cruising at 6-0 3-0, but 31-year-old American Riske, despite tossing her racket in frustration, refused to give up. Incredibly, she won 12 of the next 13 games to reach the third round at the expense of the world number nine.

"After the first set, it literally could not get any worse," Riske said in her on-court interview following a 0-6 6-3 6-1 success.

"So if I could try to get two balls in the court we might get somewhere. I was just trying to hang in there. I've played Garbine many times before and it's always been a battle."

This was Riske's fifth match against Spanish star Muguruza, and despite losing the first two of those, she had since beaten the two-time grand slam winner twice, albeit most recently at the 2019 US Open.

"I felt if I could get in there a little bit, I was going to have my chances," Riske said. "I know I've beaten her before, and if I could just bring out some of my game, good things were going to happen."

It was world number 53 Riske's 10th career victory against a player ranked in the top 10.

British player Harriet Dart pulled off a shock win over Ukrainian Elina Svitolina, as the world number 122 snatched a 2-6 6-3 6-3 victory over the 12th seed.

Three of the biggest names in the draw took the long route through to the last-32 stage, with Emma Raducanu, Simona Halep and Iga Swiatek taken to a deciding set in their opening matches, having benefited from first-round byes 

Raducanu fended off Caroline Garcia 6-1 3-6 6-1, while Halep was a 6-2 4-6 6-2 winner against Ekaterina Alexandrova, the Russian who is playing under a neutral flag.

Polish third seed Swiatek put a slow start behind her to beat Ukrainian Anhelina Kalinina 5-7 6-0 6-1 and is looking to build on her recent Qatar Open triumph. She said: "I'm pretty happy I could turn my head on to fight mode and stay focused, because that was the key I guess."

Last year's Wimbledon runner-up Karolina Pliskova bowed out, the Czech seventh seed losing 2-6 7-5 6-4 to Danka Kovinic of Montenegro.

Emma Raducanu landed her first Indian Wells victory as the US Open champion said Andy Murray inspired her to see off Caroline Garcia.

There was a certain irony about that, given Garcia is the player Murray famously once tipped to become a world number one.

But seeing fellow Briton Murray battle past Taro Daniel prior to her own match fuelled Raducanu for her opening test at the WTA Indian Wells Open.

While it was not always comfortable for the 11th seed, Raducanu recovered from a shaky second set to win 6-1 3-6 6-1 against her French opponent.

Murray's pronouncement about Garcia's prospects came on Twitter in 2011 as he watched the then little-known player take on Maria Sharapova in the French Open.

Garcia reached as high as number four in 2018, and it is now Raducanu who looks the likelier future number one, having landed a breakthrough grand slam against all the odds in New York last year.

Raducanu was beaten on her Indian Wells debut by Aliaksandra Sasnovich last October, so to land a first win came as a relief.

She said in an on-court interview: "It's amazing to be back and I'm so happy to have got my first win in the desert here. I hope to come back for many more years.

"I thought the level of tennis was pretty high today, and it means a lot to have come through that because it could have gone either way."

Raducanu said Garcia "climbed on top" of her game in the second set, but, like Murray earlier, she kept enough back for a decider.

Speaking to Amazon Prime, she revealed how seeing Murray show his battling qualities against Daniel reminded her of what it takes in trying circumstances.

"I was watching pretty much the whole match until I had to go warm up," Raducanu said. "He was down, and it was a really tough one. To see him, I kind of wanted to follow him and learn from him and he kind of inspired me to dig in today when it got tough."

She added: "To get this win after a stop-start year that I've had at the beginning, it means a lot. I'm just really happy to have given myself another opportunity.

"For sure it's difficult after dropping a set. I knew I'd slipped up, and I'd missed too many first serves, and I was just thinking... 'Just think how bad you're gonna feel after the match if you let this one go'."

Andy Murray chalked up a 700th career win with a typically gutsy performance to see off Taro Daniel in round one of the Indian Wells Masters.

Murray, 34, began slowly but ground out a 1-6 6-2 6-4 win over a player he has faced three times in the early stages of this season.

The former rankings leader has bounced back into the ATP top 100 after career-threatening injury woes and is looking to push on from number 88, his current position.

He will play 31st seed Alexander Bublik next.

Murray was delighted to reach the 700-win mark, telling Amazon Prime: "It means a lot. It's a target I set myself towards the end of last year. With everything that's gone on in the last few years, it's not been easy to get there.

"It's a great achievement; not loads of guys have been able to do that, so I'm really happy about it."

The three-time grand slam winner becomes the fourth active men's player to reach 700 wins, after Roger Federer, Rafael Nadal and Novak Djokovic.

Murray was beaten by Daniel in the second round of the Australian Open before avenging that in the Qatar Open.

The Scot has 14 titles to his name from Masters 1000 events but surprisingly has never triumphed at Indian Wells, and he was given a thorough workout by qualifier Daniel.

Daniel dashed into a 5-1 lead, striking the ball more cleanly and moving better than Murray, who has recently agreed to bring Ivan Lendl on to his team for a third time.

The Japanese star had no trouble seeing out that opening set, but the second was dominated by Murray.

Daniel then won the opening eight points of the decider to surge 2-0 ahead, but Murray broke back in the sixth game. Murray saved break point at 4-4 and made Daniel serve to stay in the contest. That proved beyond the 29-year-old, with Murray carving out three break points and taking the third of those when Daniel sent a forehand long.

Murray said he took pride from the match because he "figured it out" after being outplayed early on.

He said Lendl had wished him luck before going on court, with the pair to begin working together after Murray plays the next event in Miami.

Novak Djokovic is set to appear at next month's Monte Carlo Masters after his vaccination status left him unable to compete at Indian Wells.

The world number two has been forced to sit out the first Masters event of the year after not meeting the vaccination requirements to enter the United States, having been deported from Australia ahead of January's Australian Open for similar reasons.

Now, a post on the 20-time grand slam champion's official website suggests he will appear on the clay surface in Monaco, where the 34-year-old resides.

Monaco currently allows those who have recovered from COVID-19 in the previous six months to enter the city-state, with Djokovic claiming to have suffered from the virus in December.

"Novak will open his 2022 clay court season in Monte-Carlo, where he won the Masters 1000 title twice, in 2013 and 2015," the post reads.

The tournament now looks set to be the second to feature Djokovic in 2022 after he lost at the quarter-finals stage of last month's Dubai Tennis Championships.

The Monte Carlo Masters begins on April 10, lasting until April 17, and Djokovic will be looking to make amends after exiting last year's tournament to Dan Evans in the last 16.

Rafael Nadal, who overtook Djokovic for the most men's singles grand slam titles with his January triumph in Australia, holds the record for the most successes in Monaco, winning the tournament on 11 occasions.

Meanwhile, with France having loosened its travel restrictions for unvaccinated people this month, Djokovic will now hope to use the Monaco outing as preparation for a first grand slam appearance of the year at Roland Garros.

The Serbian now looks increasingly likely to be permitted to defend his 2021 French Open title in May after travel restrictions had originally cast doubt on his participation.

Wild card Nick Kyrgios admitted he was "pretty good" as he won in the opening round at the Indian Wells Masters over Sebastian Baez on Thursday.

The Australian cruised past Baez in one hour and 12 minutes, winning 6-4 6-0 to secure a second-round meeting with another Argentine, 32nd seed Federico Delbonis.

Kyrgios, who had not competed since January's Australian Open, was full of his typical flair, highlighted by 27-15 winners and 12-1 aces.

"When I play good, I'm pretty good," Kyrgios said after the match. "I'm just going back to basics."

Fabio Fognini made history in his 3-6 6-3 6-3 victory over Pablo Andujar, with his 392th career ATP win clocking up the most ever for an Italian, surpassing Adriano Panatta.

Compatriot Lorenzo Musetti also progressed on Thursday with a 6-3 7-5 win over American Marcos Giron.

Rising American talent Jenson Brooksby defeated Roberto Carballes Baena 6-1 6-4, while countryman and wild card Jack Sock brushed aside Juan Manuel Cerundolo 6-1 6-1 in little over an hour.

Pedro Martinez made light work of Joao Sousa 6-4 7-5, while Tomas Machec got past Alexei Popyrin 6-3 7-5.