Frances Tiafoe could face heavy fine after expletive-filled rant at Shanghai Masters

• American unhappy with time violation decision
• Tiafoe faces penalties for verbal abuse of official

US Open semi-finalist Frances Tiafoe aimed a torrent of expletives at the chair umpire after losing his third-round match at the Shanghai Masters on Tuesday.

Tiafoe targeted umpire Jimmy Pinoargote in a minute-long tirade after his 5-7, 7-5, 7-6 loss against unseeded Roman Safiullin. The American was angered after being docked his first serve for a time violation at 5-5 in the decisive tiebreaker.