LONDON— Lorenzo Musetti threw his head back and spread his arms wide to celebrate reaching his first Grand Slam semifinal at Wimbledon, then covered his face with both hands. His 3-6, 7-6 (5), 6-2, 3-6, 6-1 victory over Taylor Fritz on Wednesday was a big deal, to be sure. After all, the 25th-seeded Musetti, a
