NEW YORK: Top-ranked defending champion Naomi Osaka was ousted from the US Open on Monday (Tuesday in Manila) by Belinda Bencic while Croatian Donna Vekic erased a match point to join the Swiss 13th seed in a quarterfinal matchup.

Bencic’s 7-5, 6-4 triumph, her WTA-best sixth over a top-five foe this year, ensured 21-year-old Japanese star Osaka will fall from atop the rankings next week and won’t become the first repeat US Open winner since Serena Williams in 2014.