PARIS (AP) - 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.

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.

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