Jared Donaldson has shouted in the face of an umpire during his first-round match at the Monte Carlo Masters.
The American called umpire Arnaut Gabas onto court to dispute whether Albert Ramos-Vinolas's serve had caught the line, and the umpire was unable to reverse the decision due to being unable to see a ball mark.
Donaldson - the world number 51 - reacted by shouting in Gabas's face before demanding that the supervisor be called, which led to Gabas stating that he was unhappy with Donaldson's 'aggressiveness' and a second outburst followed.
Hawkeye - which was not in operation - suggested that Donaldson was correct, but the 21-year-old faces the possibility of disciplinary action from the ATP Tour.
The incident occurred with Donaldson a set and a break down, and Ramos-Vinolas went on to seal a 6-3 6-3 win.
