Alexander Zverev got in a heated row with the chair umpire during his quarter-final victory against Alejandro Davidovich Fokina at the French Open.
The German looked in imperious form as he wiped Fokina off the court 6-4, 6-1, 6-1 in just one hour 36 minutes.
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But the match wasn't without its drama as Zverev became infuriated when he thought a Fokina shot down the line landed out in the first set.
However, the chair umpire thought otherwise as she checked the mark and called it good.
"No, no, no! It's here! No!" Zverev said to the umpire as they argued, which mark was from the ball.
This prompted an irate Zverev to continue the argument with the chair umpire.
"No, No, No, No. No way, no. How is that not out? How?" he said.
"I never complain about much - if you say it's in or out I always agree. But how do you call this in? I know you say it is in, but it is not!"
But Zverev was never going to overturn the umpire's decision after it was made, which left him frustrated.
Fortunately, Zverev went on to claim the set and the match.
Zverev praises change of attitude
"Maybe the last few years, I was putting too much pressure on myself," Zverev said.
"Also, obviously in the media, I was seen, before Medvedev and Tsitsipas arrived, as this guy that was going to all of a sudden take over the tennis world ... I was putting bricks on myself."
Now, though, it seems like that weight has been lifted with the world No.6 discovering the art of patience.
Davidovich Fokina, a bouncy figure with a touch of the young Boris Becker about him, was out of sorts, looking uncharacteristically hangdog after two draining five-setters.
He did, however, enjoy an opening set flurry in which he broke a tense Zverev three times, tormenting him with excellent drop shots, and watched the German have a tetchy exchange with the chair umpire Alison Hughes over a line call that went against him.
But broken himself four times in the opener, it was soon downhill for the Spaniard as Zverev found his rhythm and range, powering through the next two sets for the loss of just two more games as Davidovich Fokina's unforced error count reached a sorry 37.
Zverev's final flourish was spectacular, an unstoppable backhand for his 24th winner of the afternoon which brought him a 15th successive set since his first round five-set scare against qualifier Oscar Otte.
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