Kyle Lowry will miss at least the first game of the Miami Heat's Eastern Conference Finals series against the Boston Celtics through injury.
Former world number ones Karolina Pliskova and Angelique Kerber both enjoyed routine first-round wins at the Internationaux de Strasbourg.
Dominic Thiem has only won one set this year after returning from a wrist injury, so a long run at Roland Garros looks unlikely.
Juventus boss Massimiliano Allegri only wanted to pay respect to Giorgio Chiellini and Paulo Dybala after the 2-2 draw against Lazio.