Umpire Who Got Yelled At By Serena Williams Cops Flak At Australian Open

This time, the American player having a crack at Portuguese umpire Carlos Ramos was 25-year-old year old Danielle Collins.

The world number 35 was playing Czech Petra Kvitova -- the woman who beat Australia's Ash Barty -- in the Australian Open semi finals on Thursday, when tempers flared over two calls.

With the first set in a tiebreak, Collins was on serve and pulled off a brutal first serve right into the corner, only for the ball to be incorrectly called out fractionally before Kvitova's failed return.

Collins was not happy with Ramos' decision making. (Image AAP)

This forced Ramos to ask Collins to serve again as he said the call hindered Kvitova getting to the ball.

"That happened to me like 300 times in other matches and I lost the point because of it," Collins said.

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The tiebreak continued, with Kvitova dominating to win the set, but it was a technical malfunction in the first game of the second set that caused Collins to really lose her cool.

Collins loss of control reflected her play in the second set. Image: AAP

Just before she made contact with her serve the umpire's audio signaler beeped with Collins hitting the serve fractionally out.

“Why is it beeping? It’s malfunctioning,” she told Ramos.

“You made me re-serve the [previous] point, even though I won it. Now I just hit the serve out and you’re not giving me the same.”

He responded that he was turning the machine off as it was not working properly.

Ramos thought the beep came after the serve and the commentary box agreed, but the video shows Collins may have had a case.

Serena has words with Carlos Ramos at the 2018 US Open Finals. Image: Getty Images.

It's not the first time the umpire has made headlines.

During last September's US Open Grand Final between Serena Williams and Naomi Osaka, Williams dissolved in tears after Ramos issued three code violations, which contributed to her shock defeat.

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"You owe me an apology. Say it. Say you’re sorry. ... And you stole a point from me. You’re a thief, too!" she said at the time.

Ramos, who  is a “gold-badge” umpire was cleared by the International Tennis Federation.

He has extensive experience and has umpired a final at all four grand slams, as well as the 2012 Olympic men’s final.

Back in Melbourne, Kvitova cruised through the second set against Collins to win 7-6 6-0.

She will now compete for her first Grand Slam title since 2014 against Naomi Osaka.

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Feature Image: AAP