Top seeds Novak Djokovic and Rafael Nadal secured their places in the French Open second round with routine victories on Philippe-Chatrier.
World number one Djokovic, who could hold all four Grand Slam titles for the second time in his career, beat Poland's Hubert Hurkacz 6-4 6-2 6-2.
Earlier, defending champion and second seed Nadal beat German qualifier Yannick Hanfmann 6-2 6-1 6-3.
The Spaniard is chasing a record-extending 12th title at Roland Garros.
But Djokovic is in impressive form as he chases history.