London, July 8 -- In one of the most astonishing turnarounds seen at Wimbledon in recent years, Jannik Sinner reached the quarterfinals today after Grigor Dimitrov was forced to retire mid-match while leading by two sets, in a fourth-round clash that defied belief on Centre Court. The drama began in the very first game, when Sinner, the top seed, slipped during a routine slide and jarred his elbow. Though he continued, his trademark service rhythm deserted him, and the match quickly tilted in Dimitrov's favour. The Bulgarian surged ahead, winning the first two sets with authority and appearing poised to make his first Wimbledon quarterfinal since 2014. But just as Dimitrov looked to close in on a famous victory, disaster struck. At 2-2 in t...