Nick Kyrgios was back to his old ways during his Laver Cup win over Tomas Berdych in Prague.
The world No.20 beat the former Wimbledon finalist 4-6 7-6 (7-4) 10-6 after Team Europe superstars Roger Federer and Rafael Nadal beat Sam Querrey and Jack Sock respectively on day two.
Kyrgios was a set down and serving at 5-5 in the second set when he let fly after saving a break point and delivering what he believed to be an ace.
The umpire called it a let, leaving Kyrgios incredulous.
"What? I'm about to lose my s**t if you call that a let," he was heard to say by TV cameras.
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The official stuck by his call, telling Kyrgios the decision was made for him by the beep of the net machine.
"F**k the machine though," the 22-year-old replied.
Team Europe later took a 9-3 lead when the highly anticipated doubles pairing of Federer and Nadal proved too strong Querrey and Sock, surviving a second-set scare to prevail 6-4 1-6 10-5.
