Defending champion Naomi Osaka has been knocked out of the US Open, losing 7-5 6-4 to Switzerland’s Belinda Bencic in the last 16.
The 21-year-old was broken late in the opening set and then again in the fifth game of the second under the Arthur Ashe Stadium roof at Flushing Meadows.
Japan’s Osaka will lose her world number one ranking, with Ashleigh Barty of Australia to return to the top spot.
For Bencic, it is her second appearance in the quarter-finals after also making the last eight in 2014 as a 17-year-old.
She has now beaten Osaka three times this year after previous victories in Indian Wells and Madrid.
Osaka, who beat Serena Williams in last year’s final for her maiden Grand Slam title, started off badly as she lost her serve at the first opportunity and had to save two break points to avoid going 3-0 down.
She then fought back with a break before Bencic took the decisive break in the 11th game and then served out the set.
In the second set, Osaka, who later said she had been struggling with a knee injury, double-faulted to gift Bencic another break and the Swiss player took the final game of the match with a service hold to love.
After winning the Australian Open in January for her second Grand Slam, Osaka became the world number one, a position she held until June when Barty took over.
Osaka returned to the top eight weeks later but Barty will become number one again, despite losing in the last 16 to China’s Qiang Wang on Sunday.
Bencic, the 13th seed, will play Donna Vekic in the quarter-finals.
The Croat, seeded 23rd, saved a match point as she beat Germany’s 26th seed Julia Gorges 6-7 (5-7) 7-5 6-3 in two hours and 42 minutes on Louis Armstrong Stadium.
Belgian 25th seed Elise Mertens breezed past American qualifier Kristie Ahn 6-1 6-1 in 66 minutes and will play Canadian 15th seed Bianca Andreescu or USA’s Taylor Townsend next.
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