Playing his first match since winning his 12th French Open title, Rafael Nadal had little trouble in making the switch from clay back to grass.
Nadal began his search for a third Wimbledon title by beating Japanese qualifier Yuichi Sugita 6-3, 6-1, 6-3 to reach the second round.
Also today, Roger Federer shrugged off an early deficit to beat Lloyd Harris of South Africa 3-6, 6-1, 6-2, 6-2 on Centre Court as he began his search for a record-extending ninth Wimbledon title.
Sam Querrey of the United States took the last nine games and upset No. 5 seed Dominic Thiem to make the French Open runner-up the third top-10 man already gone in Wimbledon's first round.
And hard-serving American John Isner finished off his opening match at Wimbledon in straight sets, beating Casper Ruud of Norway.
In women's action, Serena Williams opened her bid for a 24th Grand Slam title with a straight-set victory over Giulia Gatto-Monticone of Italy 6-2, 7-5.