Naomi Osaka has been eliminated from the 2019 US Open, which means Serena Williams is now the only Grand Slam winner left in the tournament

  • Naomi Osaka's defense of her US Open title came to an end Monday with a loss to Belinda Bencic.
  • Bencic beat Osaka in straight sets 7-5, 6-4, and now advances into Wednesday's quarterfinal against Donna Vekic.
  • Osaka's elimination means there is now only one Grand Slam winner left in the women's singles bracket.
  • 23-time Grand Slam champion Serena Williams, the second-highest seed, faces Wang Qiang on Tuesday.
  • Fifth seed Elina Svitolina, the highest seed left in the tournament, plays Britain's number one Johanna Konta, also on Tuesday.
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Naomi Osaka's defense of her US Open women's singles title has come to an end as she's just been eliminated from the tournament by Belinda Bencic.

Osaka lost in straight sets 7-5, 6-4 at Flushing Meadows in Queens on Monday, and Bencic said after the match that she had to play her best tennis to advance into Wednesday's quarterfinals.

"I was so excited to come on the court," Bencic said, according to the New York Times.

Read more: Novak Djokovic apologized and said his injury 'hurt' after tennis fans mercilessly booed him off the US Open court

"I think the challenge cannot be bigger: against Naomi, a great player and who obviously won the US Open last year. I had to be on the top of my game. I'm very pleased with how I played and how I managed my nerves in the end.

"She has a lot of power, I was just trying to play it a little bit like chess, anticipate, and make a tactic on the court."

It was Bencic's third win of the year over Osaka, who recently attracted headlines for the way she defeated the 15-year-old American Cori "Coco" Gauff on Saturday.

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Sights from the 2019 U.S. Open
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Sights from the 2019 U.S. Open
TOPSHOT - Alexander Zverev of Germany reacts as he plays against Diego Schwartzman of Argentina during their Round Four Men's Singles at the 2019 US Open at the USTA Billie Jean King National Tennis Center in New York on September 2, 2019. (Photo by TIMOTHY A. CLARY / AFP) (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
2019 US Open Tennis Tournament- Day Eight. Rafael Nadal of Spain reacts to his incredible shot that set up match point against Marin Cilic of Croatia in the Men's Singles round four match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 2nd, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)
NEW YORK, NEW YORK - SEPTEMBER 01: Serena Williams of the United States takes a fall during her fourth round Women's Singles match against Petra Martic of Croatia on day seven of the 2019 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2019 in Queens borough of New York City. (Photo by Chaz Neill/Getty Images)
NEW YORK, NEW YORK - AUGUST 31: Cori Gauff of the United States and Naomi Osaka of Japan speak following their Women's Singles third round match on day six of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2019 in Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
NEW YORK, NEW YORK - AUGUST 30: Serena Williams of the United States serves during of her Women's Singles round three match against Karolina Muchova of the Czech Republic on day five of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2019 in Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
Matteo Berrettini, of Italy, bites his shirt after defeating Andrey Rublev, of Russia, during the fourth round of the US Open tennis championships Monday, Sept. 2, 2019, in New York. (AP Photo/Sarah Stier)
Taylor Townsend, of the United States, reacts after losing a point to Bianca Andreescu, of Canada, during the fourth round of the U.S. Open tennis tournament, Monday, Sept. 2, 2019, in New York. (AP Photo/Jason DeCrow)
Novak Djokovic, of Serbia, walks off the court as he retires during his match against Stan Wawrinka, of Switzerland, during the fourth round of the U.S. Open tennis championships, Sunday, Sept. 1, 2019, in New York. (AP Photo/Eduardo Munoz Alvarez)
Gael Monfils, of France, returns a shot to Denis Shapovalov, of Canada, during the third round of the U.S. Open tennis tournament Saturday, Aug. 31, 2019, in New York. (AP Photo/Jason DeCrow)
Coco Gauff, of the United States, waves as she walks off court after a loss to Naomi Osaka, of Japan, during the third round of the U.S. Open tennis tournament Saturday, Aug. 31, 2019, in New York. (AP Photo/Adam Hunger)
NEW YORK, NEW YORK - AUGUST 26: Serena Williams of the United States hits a backhand against Maria Sharapova of Russia in the first round of the US Open in Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by TPN/Getty)
NEW YORK, NEW YORK - AUGUST 28: Serena Williams of the United States reacts during her Women's Singles second round match against Catherine McNally of the United States on day three of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
NEW YORK, NEW YORK - AUGUST 28: Novak Djokovic of Serbia returns a shot during his Men's Singles second round match against Juan Ignacio Londero of Argentina on day three of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Cameron Norrie of Great Britain returns a shot during his men's singles first round match against Gregoire Barrere of France during day one of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 26, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
Novak Djokovic, of Serbia, returns a shot to Roberto Carballes Baena, of Spain, during the first round of the US Open tennis tournament Monday, Aug. 26, 2019, in New York. (AP Photo/Frank Franklin II)
Serena Williams, of the United States, reacts after winning a point at the net against Caty McNally, of the United States, during the second round of the U.S. Open tennis tournament in New York, Wednesday, Aug. 28, 2019. (AP Photo/Charles Krupa)
Rafael Nadal, of Spain, celebrates after defeating John Millman, of Australia, during the first round of the U.S. Open tennis tournament Tuesday, Aug. 27, 2019, in New York. (AP Photo/Adam Hunger)
NEW YORK, NEW YORK - AUGUST 28: Venus Williams (L) of the United States shakes hands with Elina Svitolina of the Ukraine after losing to her in her Women's Singles second round match on day three of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
NEW YORK, NEW YORK - AUGUST 28: Roger Federer of Switzerland reaches to return a shot against Damir Dzumhur of Bosnia and Herzegovina during their Men's Singles second round match on day three of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Katharine Lotze/Getty Images)
NEW YORK, NEW YORK - AUGUST 27: Cori Gauff of the United States celebrates match point against Anastasia Potapova of Russia during their Women's Singles first round match on day two of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 27, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
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But defeat to Bencic brings an end to her reign as champion, as the 22-year-old Swiss player now advances into Wednesday's quarterfinal where she faces Donna Vekic, 23.

Read more: Serena Williams' coach doesn't regret breaking the rules of tennis before her infamous 2018 US Open meltdown, and even says he'd 'do the same tomorrow'

Osaka's elimination means there is now only one Grand Slam winner remaining in the entire women's singles bracket, with 23-time Grand Slam champion Serena Williams playing Wang Qiang at the Arthur Ashe Stadium on Tuesday.

Williams, last year's finalist, is the second-highest seed, behind only fifth seed Elina Svitolina who plays the British number one Johanna Konta, also on Tuesday.

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