Dimitrov was playing fantastic tennis, running Sinner around the court and delivering booming serves. Dimitrov won the first set 6-3 and survived a hard-charging comeback attempt from the Italian in the second to take the set 7-5 and put the world No. 1 in a desperate position.

After winning the first two sets and having Sinner in serious upset danger, Grigor Dimitrov had to retire due to injury in the third set. The 34-year-old from Bulgaria had battled injuries for much of his career, and he knew something was wrong with his pectoral muscle after a serve.

Tennis pro Grigor Dimitrov suffered a shock pec injury with the world's number 1 tennis player on the ropes. Dimitrov was defeating Jannik Sinner in what was shaping up to be a surprise upset and maybe the highlight of his career when he clutched his pec and grimaced in pain after a powerful serve.