Alcaraz, the reigning champion, overcame Frenchman Ugo Humbert in a hard-fought four-set encounter (6-3, 6-4, 1-6, and 7-5).
The Spaniard highlighted the importance of learning from his defeat at Queen’s to another left-hander and stated that he focused on playing each point with intensity, regardless of his position on the court.
Sinner, the world number 11, dispatched American Ben Shelton in a solid three-set match (6-2, 6-4, and 7-6). The Italian, who had already reached the Wimbledon quarterfinals on two previous occasions, was pleased to close out the match in three sets and praised the extraordinary atmosphere on the court.