Shapovalov, 17, had lost the first two sets against Kyle Edmund in the fifth and deciding rubber when he hammered the ball away in a fit of rage at 2-1 down in the third set.
Although he meant to hit it into the stands, the stray ball flew straight into the left eye of umpire Arnaud Gabas.
The stadium was stunned into silence as Shapovalov rushed to check on Gabas' wellbeing. Gabas held his hands to his left eye, as he began to come to terms with what had transpired.
