Perth Australian bad boy Nick Kyrgios gained a slice of revenge over grand slam nemesis Andy Murray with a 6-4, 7-6 (7-5) Hopman Cup win on Wednesday night.
Murray battled a mystery right leg injury for most of the match, and Kyrgios took full advantage against the world No.2.
Kyrgios beats Murray in straight sets
Nick Kyrgios has his first victory over Scotsman Andy Murray at the Hopman Cup in Perth.
"I actually did promise a couple of my friends that next time I played Andy, I was going to beat him," Kyrgios said.
"He's in the prime of his career. He's been playing some great tennis. Every time I've played him I haven't played bad.
"He's just a great player and today I knew what my game plan was going to be and how he was going to play."
The result gave Australia Green a 1-0 lead in the tie ahead of Daria Gavrilova's showdown against Great Britain's Heather Watson.
Murray entered the match holding a 4-0 win-loss record over Kyrgios.
Three of those wins had come in grand slams in 2015, including their quarter-final showdown at the Australian Open.
Kyrgios kept his cool for most of the contest.
But he became engaged in a quick exchange of words with a member of the crowd while scores were locked at 4-4 in the second set.
Nick Kyrgios beats Andy Murray in Hopman Cup
The 20-year-old Canberra native helped Australia Green secure win over Great Britain at the Hopman Cup.
Appearing irritated by comments made by the spectator, the 20-year-old Australian turned to the stand and said:
"Are you playing? Want to come down here and play? You sit in your comfy seat and watch."
Kyrgios lost the game, but he saved a break point shortly after before going on to win the match in a tie-break.
The world No.30 said his breakthrough win over Murray would give him a huge dose of confidence heading into the Australian Open.
"It doesn't matter what type of match you're playing, you always want to win," Kyrgios said.
"One hundred per cent he wanted to win that tonight. I thought it was a good match.
"He's a true champion. He'll come back and I'm sure he'll be ready, and he's a strong contender for the Australian Open."