Nick Kyrgios takes his first two wins against Andy Murray in the Hopman Cup, building up hopes for his team to take the trophy.
The 20-year-old Australian had previously lost all of his four meetings against the World number two, three in grand slams last year.
Kyrgios entered the match having lost all four of his previous matches to Murray, three in grand slams last year.
But with Murray battling a leg injury, Kyrgios went to town and trumped the Scotsman in straight sets by 6-4, 7-6 (7-5).
Later, he repeated the feat as he partnered with Daria Gavrilova in the mixed doubles, while Murray partners with Heather Watson.
The Britons lost 6-2 6-7 (0-7) 11-9 to the Australian Green team in a tense deciding rubber 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.”
Later, Watson went on to beat Gavrilova 6-7 (2-7) 6-2 7-5 in a thrilling match to set up a deciding mixed doubles rubber, which Britain lost when Kyrgios served out an ace on Australia’s fourth match point.