The incident happened during a Canada-Britain tie in Ottawa.

The 17-year-old said he was "ashamed" by his behaviour which resulted in his immediate disqualification and the tie being handed to Britain.

"After dropping serve in the third game of the third set, Denis Shapovalov hit the ball very hard, unintentionally striking chair umpire Arnaud Gabas in the left eye, causing him to need medical attention," the International Tennis Federation said in a statement on Monday.

Edmund was leading two sets to love and broke the Canadian's serve in the third set prompting Shapovalov to smash the ball at the umpire.

"Referee Brian Earley, who witnessed the incident, declared an immediate default of Mr Shapovalov for unsportsmanlike conduct. It was clear that Mr Shapovalov did not intend to hit Mr Gabas," the ITF said.