WIMBLEDON, England — Defending Wimbledon champion Carlos Alcaraz came up with the big shots when it mattered most to hold off Ugo Humbert and reach the quarterfinals with a 6-3, 6-4, 1-6, 7-5 win on Centre Court on Sunday.

The match had seemed all but over when Alcaraz clinched the second set by chasing down several seemingly out-of-reach shots on set point, even falling over after hitting one forehand and quickly getting back up to get to the next ball.

Asked to describe his play on that point, Alcaraz just said: “Unbelievable, I guess.”

But Humbert nearly staged a surprising comeback and threatened to take the match into a fifth set when he held three straight break points for a 5-3 lead in the fourth.

Alcaraz came back to win that game with the help of a couple of aces then broke for a 6-5 lead by hitting a deep forehand winner.

He set up match point with one of his delicate forehand drop shots and converted it with a service winner.

“I felt great playing today. I think I played at a really high level,” said Alcaraz, who will next play the winner of the match between No. 12 Tommy Paul and Roberto Bautista Agut.