Nick Kyrgios refused to apologise for his Miami Open meltdown Tuesday and insisted he couldn’t care less about receiving further sanctions from tennis bosses.

Kyrgios, who was fined $25,000 for racquet abuse and verbal obscenities after losing to Rafael Nadal in Indian Wells earlier this month, lost his head in the Miami heat and spent his fourth-round match delivering a blistering verbal assault on “dreadful” Brazilian match umpire Carlos Bernardes before crashing out 7-6 (7/3), 6-3 to Italy’s Jannik Sinner. The Australian became involved in a running war of words after the walkie-talkie of Bernardes went off mid-point in the first set.