World number three Carlos Alcaraz defeated French 16th seed Ugo Humbert 6-3, 6-4, 1-6, 7-5 to make the quarter-finals of a Grand Slam for the ninth time in just 14 appearances.

However, it was another uncomfortable afternoon for the Spaniard, who had needed five sets to see off Frances Tiafoe in the third round.

His erratic performance on Sunday saw him drop serve five times and commit an uncharacteristic 33 unforced errors.

The 21-year-old, bidding to become just the sixth man to win the French Open and Wimbledon back-to-back, eased through the first set under the Centre Court roof before crucially saving four break points in the fifth game of the second.

"I will be there, fighting until the last ball," said Alcaraz, who is chasing a fourth Grand Slam title.

Alcaraz will take on American 12th seed Tommy Paul, who beat Roberto Bautista Agut 6-2, 7-6 (7/3), 6-2.

Over on Court One, top seed Sinner moved into the last-eight with a 6-2, 6-4, 7-6 (11/9) win over American 14th seed Ben Shelton.

Sinner, who won his maiden Slam crown at the Australian Open this year, will face Russian fifth seed Daniil Medvedev for a place in the semi-finals in a rematch of their final in Melbourne.

"It was a tough match, especially the third set. I had to keep saving set points," said Sinner, a semi-finalist in 2023. (AFP)