Carlos Alcaraz inched a step closer to defending his Wimbledon title with a hard-fought victory over Ugo Humbert.

The 21-year-old Spaniard held off a late charge from 16th seed Humbert to win 6-3 6-4 1-6 7-5 and move into the last eight at SW19.

It took Alcaraz’s winning streak at Grand Slams to 11 following his French Open triumph last month.

“I feel great playing today, I think I played a really high level,” he said.

“Playing a leftie, I try not to think about it and play my own game.”

Alcaraz will next face compatriot Roberto Bautista Agut or American 12th seed Tommy Paul, the Queen’s Club champion.

Meanwhile, world number one Jannik Sinner defeated American 14th seed Ben Shelton 6-2 6-4 7-6 (11-9).

Shelton, who won in five sets in his first three rounds, had four set points in the third-set tie-break.

It seemed unlikely Sunday’s opening match on Centre Court would live up to the five-set classic Alcaraz played against Frances Tiafoe on Friday.

And it became even more improbable when, with little effort, he found himself two sets up in what appeared a relatively dull encounter.

But the three-time major winner suddenly faltered in the third set and Humbert stepped up to take advantage.

The Frenchman, 26, raised his intensity, hitting the chalk with brilliant winners and breaking serve three times to force a fourth set.

Both players struggled to hold in a tense set, and an increasingly frustrated Alcaraz turned to the crowd and his team for help, waving his arms animatedly to stir up support.