American tennis star Frances Tiafoe has apologized for his behavior at the ATP Shanghai Masters after he berated the chair umpire after losing in the third round. Tiafoe was angry that he had been given a pair of time violations, including one late in the third-set tiebreak in a match he would end up losing to unseeded Roman Safiullin.

U.S. Open semifinalist Frances Tiafoe has aimed a torrent of expletives at the chair umpire after losing a match at the Shanghai Masters

American tennis star Frances Tiafoe let loose at the chair umpire on Tuesday after a controversial call during his loss at the ATP Shanghai Masters.