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Top seed and defending champion Naomi Osaka crashed out of the US Open in the fourth round after a straight-sets defeat by Belinda Bencic .
Osaka has been carrying a knee injury and called the trainer and a medic on midway through the second set, although she was able to carry on without receiving any treatment.
However, the 21-year-old from Japan was beaten 7-5 6-4 by the Swiss 13th seed.
Osaka said: “I hurt my knee in Cincinnati, but it’s getting better. I don’t want to say that that’s the reason that I lost, because I obviously had played three matches before this.
“Right now I have this feeling of sadness, but I also feel like I have learned so much during this tournament. Honestly, of course I wanted to defend this tournament.
US Open 2019 - best pictures Show all 64 1 /64US Open 2019 - best pictures US Open 2019 - best pictures Day one A plane comes in over the New York City skyline as seen from the Arthur Ashe Stadium
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US Open 2019 - best pictures Day one The opening ceremony before the match of Serena Williams of the US against Maria Sharapova from Russia
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US Open 2019 - best pictures Day One Cameron Norrie of Great Britain returns a shot during his men's singles first round match against Gregoire Barrere of France
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US Open 2019 - best pictures Day one Maria Sharapova of Russia returns the ball to Serena Williams
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US Open 2019 - best pictures Day one Roger Federer of Switzerland throws balls to members of the public after defeating Sumit Nagal
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US Open 2019 - best pictures Day two Garbine Muguruza of Spain hits a return against Alison Riske
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US Open 2019 - best pictures Day two Garbine Muguruza of Spain serves against Alison Riske
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US Open 2019 - best pictures Day two Dominic Thiem of Austria against Thomas Fabbiano of Italy
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US Open 2019 - best pictures Day three Novak Djokovic of Serbia receives treatment between games against Juan Ignacio Londero of Argentina
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US Open 2019 - best pictures Day three Novak Djokovic of Serbia celebrates after defeating Juan Ignacio Londero
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US Open 2019 - best pictures Day three Serena Williams of the US celebrates her wictory against Caty McNally
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US Open 2019 - best pictures Day three Serena Williams of the United States reacts during her Women's Singles second round match against Catherine McNally
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US Open 2019 - best pictures Day three Roger Federer of Switzerland celebrates after defeating Damir Dzumhur of Bosnia and Herzegovina
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US Open 2019 - best pictures Day four Taylor Townsend of the US reacts after winning against Simona Halep
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US Open 2019 - best pictures Day four Coco Gauff of the US reacts to winning her match against Timea Babos of Hungary
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US Open 2019 - best pictures Day four Alexander Zverev of Germany celebrates after defeating Frances Tiafoe of the US
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US Open 2019 - best pictures Day five Serena Williams of the United States reacts during of her Women's Singles round three match against Karolina Muchova of the Czech Republic
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US Open 2019 - best pictures Day six Naomi Osaka of Japan consoles Coco Gauff
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US Open 2019 - best pictures Day six Naomi Osaka of Japan consoles Coco Gauff
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US Open 2019 - best pictures Day six Rafael Nadal of Spain serves against Hyeon Chung of Korea
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US Open 2019 - best pictures Day six Rafael Nadal from Spain serves to Hyeon Chung from Korea
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US Open 2019 - best pictures Day six Hyeon Chung of South Korea hits a return to Rafael Nadal of Spain
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US Open 2019 - best pictures Day six Gael Monfils of France celebrates after his match against Denis Shapovalov of Canada
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US Open 2019 - best pictures Day six Nick Kyrgios of Australia reacts vs Andrey Rublev
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US Open 2019 - best pictures Day six Andrey Rublev of Russia celebrates winning his Men's Singles third round match against Nick Kyrgios of Australia
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US Open 2019 - best pictures Day seven Novak Djokovic retired from his US Open clash with Stanislas Wawrinka due to a left shoulder injury
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US Open 2019 - best pictures Day seven Serena Williams of the United States celebrates after winning her Women's Singles fourth round match against Petra Martic of Croatia
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US Open 2019 - best pictures Day seven Roger Federer made light work of David Goffin
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US Open 2019 - best pictures Day seven Johanna Konta celebrates beating Karolina Pliskova on her way to the quarter-finals
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US Open 2019 - best pictures Day seven Qiang Wang of China celebrates winning her Women's Singles fourth round match against Ashleigh Barty of Australia
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US Open 2019 - best pictures Day eight Osaka struggled against Bencic
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US Open 2019 - best pictures Day eight Osaka waves goodbye to the US Open fans
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US Open 2019 - best pictures Day eight Rafael Nadal saw off Marin Cilic to reach the US Open last eight
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US Open 2019 - best pictures Day eight Marin Cilic lost to Nadal in four sets after putting up a good fight
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US Open 2019 - best pictures Day eight Alexander Zverev of Germany reacts as he plays against Diego Schwartzman of Argentina
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US Open 2019 - best pictures Day eight Alexander Zverev receives a code violation during his defeat by Diego Schwartzman
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US Open 2019 - best pictures Day nine Roger Federer of Switzerland hits a backhand against Grigor Dmitrov
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US Open 2019 - best pictures Day nine Grigor Dimitrov of Bulgaria falls as he plays Roger Federer of Switzerland
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US Open 2019 - best pictures Day nine Grigor Dimitrov of Bulgaria wins the quarterfinal match against Roger Federer of Switzerland
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US Open 2019 - best pictures Day nine Roger Federer of Switzerland reacts as he leaves the court after losing to Grigor Dimitrov of Bulgaria
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US Open 2019 - best pictures Day nine Daniil Medvedev of Russia hits a return to Stan Wawrinka of Switzerland
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US Open 2019 - best pictures Day nine Daniil Medvedev of Russia (L) hugs Stan Wawrinka of Switzerland after defeating him in their Men's Singles Quarterfinal match
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US Open 2019 - best pictures Day nine Daniil Medvedev of Russia is interviewed on court after beating Stan Wawrinka
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US Open 2019 - best pictures Day nine The sun sets behind the Manhattan skyline as Serena Williams of the United States faces Qiang Wang of China in a quarterfinal match
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US Open 2019 - best pictures Day nine Serena Williams of the US reacts after defeating Qiang Wang of China during their quarter-finals round match
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US Open 2019 - best pictures Day nine Serena Williams, of the United States, returns a shot to Qiang Wang, of China, during the quarterfinals
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US Open 2019 - best pictures Day 10 Rafael Nadal celebrates his victory over Diego Schwartzman in the US Open quarter-finals
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US Open 2019 - best pictures Day 10 Matteo Berrettini celebrates after beating Gael Monfil to reach the semi-finals
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US Open 2019 - best pictures Day 10 Bianca Andreescu is through to the semi-finals of a Grand Slam for the first time
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US Open 2019 - best pictures Day 10 Belinda Bencic reached the last four of the US Open
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US Open 2019 - best pictures Day 11 Serena Williams came past Elina Svitolina to reach yet another US Open final
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US Open 2019 - best pictures Day 11 Bianca Andreescu beats Belinda Bencic in the semi-finals
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US Open 2019 - best pictures Day 12 Rafael Nadal reaches the final where he will play Daniil Medvedev
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US Open 2019 - best pictures Day 13 Bianca Andreescu arrives on court listening to music before the final
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US Open 2019 - best pictures Day 13 Bianca Andreescu reacts as she wins against Serena Williams of the during the women's singles final – her first grand slam title
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US Open 2019 - best pictures Day 13 Bianca Andreescu of Canada reacts as she wins against Serena Williams of the US during the Women's Singles Finals match
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US Open 2019 - best pictures Day 13 Bianca Andreescu poses with the trophy after she won against Serena Williams
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US Open 2019 - best pictures Day 14 Bianca Andreescu of Canada poses with her trophy at the Top of the Rock in Rockefeller Center
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US Open 2019 - best pictures Day 14 Daniil Medvedev of Russia wipes his face while playing Rafael Nadal
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US Open 2019 - best pictures Day 14 Rafael Nadal, of Spain, reacts after defeating Daniil Medvedev, of Russia, to win the men's singles final of the U.S. Open
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US Open 2019 - best pictures Day 14 Rafael Nadal of Spain reacts after defeating Daniil Medvedev of Russia during the men's final match
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US Open 2019 - best pictures Day 14 Rafael Nadal of Spain reacts during the men's Singles Finals match against Daniil Medvedev
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US Open 2019 - best pictures Day 14 Rafael Nadal of Spain (L) celebrates his victory over Daniil Medvedev of Russia (R)
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US Open 2019 - best pictures Day 14 Rafael Nadal of Spain holds the trophy after his win over Daniil Medvedev
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“I feel like the steps that I have taken as a person have been much greater than, like, I would imagine at this point.
“So I hope that I can keep growing. I know that if I keep working hard, then of course I’ll have better results.”
Her defeat came just a day after men’s champion Novak Djokovic also bowed out after retiring at two sets down to Stan Wawrinka.
Osaka waves goodbye to the US Open fans (USA Today) Osaka was cheered to the rafters as she trudged off court, a crowd favourite now after the way she consoled American youngster Coco Gauff following their match on Saturday night.
It was a third straight win for Bencic over Osaka this year, and she said: “The challenge cannot be bigger against Naomi, she won this title last year.
“I’m really pleased with my game and how I handled my nerves.
“I tried taking the serve early and trying to anticipate, because she has a lot of power. I don’t hit so many winners. I try to play it a little bit like chess.
“I was in the stadium watching the (Gauff) match and thought it was an unbelievable moment for tennis. What Naomi did is what a true champion would do.”
Osaka struggled against Bencic (AFP/Getty) Bencic will play Donna Vekic in the quarter-final after the Croatian came from a set down to beat Julia Goerges of Germany.
Goerges had a match point in the second set but ended up losing 6-7 (5) 7-5 6-3.
The runs of American wild card Kristie Ahn and qualifier Taylor Townsend came to an end late on Monday night.
New Yorker Ahn was beaten 6-1 6-1 by Elise Mertens while Chicago’s Townsend lost to 15th seed Bianca Andreescu of Canada 6-1 4-6 6-2.
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