Novak Djokovic survived a second-set wobble to book his place in the French Open second round with a four-set opening victory over Evgeny Korolev.
The third seed and former Australian Open champion won 6-1 3-6 6-1 6-3 on Suzanne Lenglen Court to set up a meeting with either Kei Nishikori or Santiago Giraldo.
Djokovic looked like steamrollering his opponent after racing to a set and a break lead. But the Serb lost six of the next seven games as Korolev - a cousin of Anna Kournikova - went for broke, especially on his forehand.
The Kazakh was forced to save break-back points serving for the set, and double-faulted on his first set point, but he kept his composure to serve it out.
The same could not be said in the third set as Djokovic raced to a 5-0 lead before comfortably moving 2-1 ahead in sets.
The 23-year-old did not hang around in the fourth either, instantly breaking his opponent, who battled well but was broken again serving to stay in the match.