Naomi Osaka gave herself a talking-to in the toilet before battling through to the third round of the US Open.

The former champion brought a whole new meaning to Flushing Meadows when she scurried to the bathroom after dropping the second set against doubles specialist Katerina Siniakova.

When the Japanese star returned to Arthur Ashe Stadium she won five of the final six games to triumph 6-2, 5-7, 6-1.

“The match was definitely really tough, and I just felt like I was a little bit too hard on myself after opportunities in the second set,” said Osaka.

“I took the bathroom break, regrouped a little, came back and just tried to have no regrets.

“I just told myself that it’s an honour to play on this court, so to keep fighting as best as I can.

“The energy from the crowd, it’s very lively, and I have the experience of growing up here and playing on this court many times. It’s really fun.”

Osaka arrived on court in another extravagant outfit, a white jacket with train, and had swapped her black basketball-inspired vest and skirt for a silver version.

There was controversy surrounding Osaka’s first-round match when a suite filled with apparent social media influencers had to be warned by security for taking pictures using a bright light.

Osaka said she did not notice the light, but did hear some shouting, and she also noted the umpire during Thursday’s match telling the crowd to quieten down “more than I’ve ever heard an umpire tell a crowd to be quiet”.

She added: “I think, obviously, if you come to a sporting event, you have to respect the sport.

“I feel like it’s common courtesy to, like, read up on the sport, especially, like, the etiquette.

“I feel like it could be a good thing for people to make the sport of tennis popular to their specific audience, but I think it has to be managed a lot better, especially in the situation like first-round match.”

The former world No 1 will face Belgian 23rd seed Elise Mertens in the last 32.

Another previous New York winner, the 2022 champ Iga Swiatek, comfortably beat Argentina’s Nadia Podoroska 6-3 6-2.

Last year’s runner-up Amanda Anisimova, the American 10th seed, needed three sets to get past talented Austrian Lili Tagger 6-3 3-6 6-1.

Another home player, the 2017 finalist Madison Keys, came back from 5-2 down in the third set against Hungarian Anna Bondar to win after a deciding 10-point tie-break.