The first day of the US Open delivered some thrilling action. While the majority of eyes were on the five-set epic between Andy Murray and Stefanos Tsitsipas, there were a number of stories unfolding in the women’s draw as well.

The likes of Coco Gauff, Aryna Sabalenka and Elina Svitolina all advanced to round two, but there were also notable victories for some top stars who have struggled in recent weeks.

Here are the biggest winners from day one:

Naomi Osaka

Defending champion Osaka claimed a straight-set victory in her first-round match to secure her first Grand Slam win since the French Open.

The third seed beat world number 87 Marie Bouzková 6-4 6-1 and will play Serbia’s Olga Danilović in the next round.

It was an impressive performance from the Japanese star, who has missed the last two majors and won just three matches in the last three months.

Following the match, the 23-year-old said she felt “really comfortable” being back at Flushing Meadows and that it was “kind of crazy” having fans back after last year’s competition behind closed doors.

"Last year when we didn't have a crowd I know it felt quite lonely for me," she said.

"I'm just really glad to see little kids in the audience and of course grown-ups too. To be playing the first night match is something I've never done before so I'm just glad I won."