British qualifier Lily Miyazaki earned her first win at a Grand Slam with a confident display against Margarita Betova on day one of the US Open.
The 27-year-old won 6-3 6-3 in New York and her reward is a second-round match against Swiss 15th seed Belinda Bencic.
Miyazaki, who was born in Japan and moved to London aged 10, had never previously qualified for a major.
She came through three matches to reach the main draw and continued that form against an out-of-sorts Betova.
"I'm lost for words right now," said Miyazaki. "Coming into the tournament I didn't expect to be at this stage.