Kei Nishikori chalked up his 50th career Grand Slam win Monday at the French Open, finishing his rain-delayed opening match in a straight-set win over Italy's Simone Bolelli, 6-1, 7-5, 6-3.

Resuming play from Sunday with a 2-1 lead in the third set, Nishikori went on to grab a break and go up 5-3. He fended off two break points in the final game and served up an ace for the victory.

"It was only the first match but it took so long. I wish we didn't have to take two days. We finished late last night and I had trouble recovering," said Nishikori of the three-hour match that was eventually suspended.