Jannik Sinner gets Wimbledon reprieve as Grigor Dimitrov forced to retire when two sets up

Dimitrov was on course for a stunning upset when he suffered a chest injury.

Jannik Sinner (left) checks on Grigor Dimitrov after he went down injured (Jordan Pettitt/PA)

Grigor Dimitrov suffered Wimbledon heartbreak when he was on the verge of knocking out world number one Jannik Sinner.

The 34-year-old Bulgarian was two sets up and playing some inspired tennis when, at 2-2 in the third set, he clutched his chest after serving an ace.