French Open debutant Peyton Stearns produced the biggest win of her career by defeating former champion Jelena Ostapenko to reach the third round at Roland Garros on Wednesday. (More Tennis News)

Stearns, a former player at the University of Texas, only turned professional in June last year.

Ostapenko won the 2017 French Open but has since failed to advance past the 3rd round. The 17th-seeded Latvian dropped her serve five times against Stearns and hit 28 unforced errors in her 6-3, 1-6, 6-2 loss.

The 21-year-old Stearns has been climbing the WTA rankings and entered the French Open at No. 69 on the back of an encouraging clay-court campaign.

Third-seeded Jessica Pegula also advanced after Camila Giorgi retired due to injury. The American led 6-2 when her Italian rival threw in the towel.?

Only hours after husband Gael Monfils won a five-set thriller in Tuesday night's session, Elina Svitolina rallied past qualifier Storm Hunter 2-6, 6-3, 6-1.

In the men's bracket, former runner-up Stefanos Tsitsipas ousted Roberto Carballes Baena 6-3, 7-6 (4), 6-2. The fifth-seeded Greek was a bit slow to find his range and was made to work hard for two sets but rolled on after he won the tiebreaker.?

No. 1 Carlos Alcaraz and No. 3 Novak Djokovic are on court later. Alcaraz meets Taro Daniel on Court Philippe Chatrier, where Djokovic will follow against Martin Fucsovics in the night session.