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Defending champion Naomi Osaka has been knocked losing 7-5 6-4 on Monday to Switzerland’s Belinda Bencic in the previous 16.
21, osaka, has been broken late in the opening set and again in the fifth game of the second in Flushing Meadows.
This means that the Japanese player will lose her world number one position, with French Open champion Ashleigh Barty of Australia to come back to the spot.
To get Bencic, 22, it’s her second appearance in the quarter-finals.
She made the last eight in 2014 and will play Croatia’s Donna Vekic following the 23rd seed defeat Germany’s 26th seed Julia Goerges 6-7 (5-7) 7-5 6-3 in a match that lasted two hours 42 minutes Louis Armstrong Stadium.
“I was excited to return on the court, the battle cannot be bigger – Naomi Osaka is a wonderful player and won the US Open last year,” said Bencic. “I needed to be at the top of my game and am very happy with how I played.
“She’s a lot of electricity, I was just attempting to play with it somewhat like chess, anticipate and make a strategy on the court”
Osaka, who beat Serena Williams in last year’s closing for her Grand Slam title, had to save two break points to avoid going 3-0 down and started off as she lost her serve at the first chance .
She subsequently fought again with a break before Bencic served out the series and then took the decisive break in the 11th game.
An Osaka double mistake gifted Bencic another break as well as the player took the final game of the match with a service game to love.
Osaka became the world number one, a position she held before June before Barty shot over after winning the Australian Open in January for the Grand Slam.
Osaka returned into the eight weeks even though losing to the Qiang Wang of China in the 16 on Sunday but Barty will end up number one again.
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