"The umpire directly influenced the match with his bad calls...I am really sorry that I was not able to control my emotions, because I let someone to affect me so much."

Following an angry set of exchanges with the umpire, Damir Džumhur was defaulted from Acapulco for walking off the court during the qualifying rounds.

"I have chosen to leave the court voluntarily," Dzumhur said.

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