Kei Nishikori won his 100th career Grand Slam match on Wednesday to ease into the second round at Wimbledon with a straight-sets victory over Australia's Alexei Popyrin.

Nishikori, ranked 53rd in the world, needed just under two hours to defeat the No. 67 Australian. The 21-year-old Popyrin blasted 10 aces but failed to win a single break point in the 6-4, 6-4, 6-4 match.

"I was able to keep him under pressure even with my stroke play and grab the initiative. It went amazingly well," said Nishikori, who was facing the 192-cm player for the first time.