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Australian tennis star Nick Kyrgios has insisted he does not care about receiving further sanctions and has refused to apologise for his outburst at the Miami Open on Tuesday. Kyrgios engaged in a spat with Brazilian match umpire Carlos Bernandes during his fourth-round match with Jannik Sinner.

Kyrgios lost his cool after Bernandes' walkie-talkie went off during a point in the first set. The 26-year-old was furious, labelling the umpire 'dreadful' and 'an absolute clown' before losing 7-6(3) 6-3 to the Italian.

This is one of the biggest tournaments and you guys can't do your job," Kyrgios declared. "It's embarrassing. You wonder why no one watches this sport. It's a laughing stock."

After already receiving a code violation for foul language, Kyrgios was given a point penalty at 5-3 in the first set