Naomi Osaka Defeated by American Danielle Collins in the US Open first round.

Collins, who was the 19th seed in Queens and won the Australian Open finals in January, was too fierce.

At 12:30 a.m. on Wednesday, Collins won the first-set tiebreaker and defeated the unseeded Osaka 7-6, 6-3.

I tend to think a lots, to the point where I overthink.

When I play matches, I sometimes have to remind myself to stop thinking and simply act more instinctively," said Osaka, 

 Who has recently been bothered by a bad back. 

"There's a lot of like random stuff in my thoughts right now,"

Naomi said. "I feel like I just have to calm down a little bit."

Osaka, who has won two U.S. Open championships (in 2018 and 2020) but has experienced mental health problems.

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