Novak Djokovic wasted a few opportunities but safely reached the third round of the French Open with a 7-5 6-3 6-4 victory against Belgian qualifier Steve Darcis
The world number one dropped serve twice when he seemed to be strolling towards a straightforward victory, his 50th at Roland Garros.
"It was a bit difficult but I'm happy I won in three sets," said Djokovic.
Rafael Nadal became the eighth player to record 200 grand slam victories, thumping Argentina's Facundo Bagnis 6-3 6-0 6-3.
After losing the first two games, Nadal won 18 of the next 22 and arrives in the last 32 having barely broken sweat.
The nine-time champion said: "I didn't even know, so the most important thing is a victory in the second round more than the 200 victories. That's only another number."
The Williams sisters followed each other into the third round in ruthless fashion.
Defending champion Serena and her elder sister Venus, seeded ninth, respectively beat Brazilian Teliana Pereira and American Louisa Chirico 6-2 6-1.