Roger Federer is in action on the opening day of the French Open.

Returning to play at Roland Garros for the first time since 2015, Federer opens against 73rd-ranked Lorenzo Sonego in the third match on Court Philippe Chatrier.

Also Sunday, 2016 champion Garbine Muguruza faces 96th-ranked American Taylor Townsend in the first match at the tournament’s newest stadium, Court Simonne Mathieu.

Switzerland's Roger Federer returns the ball during his match against Portugal's Joao Sousa at the Italian Open tennis tournament, in Rome, Thursday, May, 16, 2019. (AP Photo/Gregorio Borgia)
Switzerland’s Roger Federer returns the ball during his match against Portugal’s Joao Sousa at the Italian Open tennis tournament, in Rome, Thursday, May, 16, 2019. (AP Photo/Gregorio Borgia)

Sixth-seeded Stefanos Tsitsipas, who beat Federer at the Australian Open, plays Maximilian Marterer.

Others in action include: seventh-seeded Kei Nishikori; last year’s semifinalist Marc Cecchinato; last week’s Italian Open champion Karolina Pliskova, Venus Williams and Sloane Stephens.

The French Open is the only one of the four Grand Slam tournaments to begin on a Sunday.

Switzerland's Roger Federer serves the ball during his match against Portugal's Joao Sousa at the Italian Open tennis tournament, in Rome, Thursday, May, 16, 2019. (AP Photo/Gregorio Borgia)
Switzerland’s Roger Federer serves the ball during his match against Portugal’s Joao Sousa at the Italian Open tennis tournament, in Rome, Thursday, May, 16, 2019. (AP Photo/Gregorio Borgia)

___