Watch astonishing moment Frances Tiafoe yells ‘F*** YOU’ five times at umpire as he walks off court after loss

FRANCES TIAFOE repeatedly swore at the umpire after a controversial call led to him losing a decisive tiebreak.

The American was defeated by Roman Safiullin 5-7 7-5 7-6 in the second round of the Shanghai Masters today.

Tennis TVFrances Tiafoe swore eight times at the umpire[/caption] Tennis TVThe American was hit with a controversial time violation in a decisive tiebreak[/caption]

With the score 5-5 in the final set breaker, Tiafoe was hit with a time violation for taking too long before serving.