Canadian Vasek Pospisil threw a profanity-laced tantrum aimed at the ATP Tour's chairman during his first-round loss to American Mackenzie McDonald at the Miami Open on Wednesday.
The meltdown, which included angrily hitting a ball out of the court and shouting at the chair umpire, began when the world number 67 smashed his racket on the court late in the first set of his 6-3 4-6 6-3 defeat.
A verbal abuse penalty on set point cost him the first set and the longtime ATP critic decided to target chairman Andrea Gaudenzi.
"For an hour-and-a-half yesterday, chair of the ATP ******* screaming at me in a player meeting for trying to unite the players," he said to chair umpire Arnaud Gabas.
"For an hour and a half. The leader of the ATP. Get him out here. ******* *******. Why am I supporting this?"
Pospisil and world number one Novak Djokovic last year launched the Professional Tennis Players' Association (PTPA), which they said is designed to better protect the interests of players.