'You're going to apologise': 'Angry' Gauff grills umpire

Coco Gauff became locked in a heated argument with the chair umpire during her round of 16 win over Czech player Karolina Pliskova at the Dubai Tennis Championships.

The reigning US Open champion and world No.3 dropped the opening set 2-6 to Pliskova but was up 4-2 in the second when an erroneous ruling was made against her by the umpire.

Gauff challenged a first-serve decision that had been called out, winning her appeal to have the point overturned.

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However, chair umpire Pierre Bacchi judged his incorrect out call had hindered Pliskova's chances of returning Gauff's serve, so ordered the point be replayed.

This angered Gauff, who argued Bacchi's out call came after Pliskova had attempted to return the ball, hitting the net.

It triggered a lengthy squabble in which Gauff repeatedly challenged the late ruling before demanding she speak to the tournament supervisor.

"You called it out after she hit it. The ball was already in the net when she hit it," Gauff said.

Bacchi appeared to hold firm on his decision.

"Can you not cut me off for two seconds? Call the supervisor … You can't deny me the supervisor. I'm going to ask her what the rule is," Gauff continued.

"The call was a late call. 

"Everybody here knows you called the ball way after she hit it, it should be my point.

"Call the supervisor. Why can't you call her?

"You're going to apologise to me later because you know you messed up."

All of Gauff's attempts to request the court supervisor to clarify the rule were rejected.

Replays of the incident confirmed that there had been a significant delay before Bacchi's call, however the umpire's ruling had little impact on the result as the American teenager progressed to the quarter finals with a 2-6 6-4 6-3 victory.

Speaking after the match, Gauff stated that she was spurred on by the drawn-out stoppage.

"It definitely gave me some adrenaline," she said.

"Luckily I was able to overcome that pretty quickly. I'm glad I was able to reset.

"I think it just fuelled me. I want to watch back the video. It's just one point. It happens in tennis. Players make mistakes, everybody makes mistakes.

"It kind of went upward from there for me. I was trying to tell myself to stay calm [for] the next point.

"Sometimes I get angry and I go for too much. I was trying to let that not be the turning point for the set.

"Maybe I dragged it out a little longer than I needed to, but I did what I felt was best in that moment."

The incorrect call marked the second controversy involving Bacchi at the Dubai Tennis Championships after Australian Storm Hunter earlier stopped play for a let call before learning it had come from an adjacent court.

Gauff's run at the event ended on Thursday morning when she was defeated by Anna Kalinskaya in three sets.