Stefanos Tsitsipas refused to play in his Shanghai Masters match against Daniil Medvedev on Wednesday, accusing umpire Fergus Murphy of bias.
What happened?
The incident occurred during the second set when Tsitsipas lost his first serve after being issued a time violation.
Tsitsipas took the decision as a personal attack by Murphy.
He said 'Why are you doing this to me, man? I’m the most consistent player on the tour'.
Why it matters for Stefanos Tsitsipas
Murphy stood his ground, explaining that the clock starts automatically and he has no control over it.
But Tsitsipas was unrelenting, asking 'Why are you guys against me suddenly? I don't understand'.
He also took a personal shot at Murphy, saying 'You have never played tennis in your life. You have no clue about tennis, it seems like'.
What comes next?
The match resumed, but Tsitsipas would double fault and took issue with Murphy again, refusing to continue play unless he spoke with a supervisor.
On Wednesday, Tsitsipas lost the match 7-6 (3), 6-3.
The incident follows a heated moment between American tennis star Frances Tiafoe and chair umpire Jimmy Pinoargote on Tuesday.
Tiafoe issued an apology after firing off several expletives at the game official following his loss in the third round.
He said 'I really apologize for the way I acted tonight. That is not who I am and not how I ever want to treat people'.
Tsitsipas's outburst has sparked a debate on fairness in tennis, with some questioning the consistency of umpiring decisions.
The Greek tennis player has been in fine form recently, but his temperament has been called into question.
And his behavior on Wednesday has raised concerns about his ability to handle pressure.
But Tsitsipas remains one of the top players in the world, with a strong record in Grand Slam tournaments.
So his fans will be hoping he can bounce back from this setback and continue to compete at the highest level.
The Shanghai Masters continues on Thursday, with several high-profile matches scheduled to take place.
Tsitsipas's next match will be closely watched, as he looks to put this incident behind him and focus on his tennis.
He will be looking to improve his ranking and make a deep run in the tournament.
The pressure will be on, but Tsitsipas has the talent and experience to succeed.
He just needs to keep his cool and play to his strengths.
The tennis world will be watching with interest to see how he responds to this challenge.
And Tsitsipas will be hoping to make a statement and prove his doubters wrong.
On 18 June, Tsitsipas finished 2nd in the French Open, and he will be looking to build on that result.
He has been working hard on his game, and it will be interesting to see how he performs in the coming weeks.
The future is bright for Tsitsipas, and he has the potential to become one of the all-time greats.
But for now, he just needs to focus on his next match and take it one step at a time.
The Shanghai Masters is a prestigious tournament, and Tsitsipas will be looking to make a strong impression.
He has the skill and determination to succeed, and his fans will be cheering him on every step of the way.
The world of tennis is waiting to see what Tsitsipas will do next.
And he will be looking to make a big impact and prove himself as one of the best players in the world.