Nick Kyrgios and Gilles Simon both mocked Rafael Nadal's service routine after each received time violations during their encounter at the Australian Open.
Kyrgios pretended to sweep back his hair and pick at his shorts after being penalised, prompting the crowd, and chair umpire Jaume Campistol, to laugh.
Simon followed suit later, causing Kyrgios to bend over in hysterics.
Kyrgios has previously slammed Nadal for his slow service game, calling it "bull----" and "ridiculous," during their second-round match at last year's Wimbledon, according to Eurosport.
The Australian and Nadal will meet in the fourth round of The Open if they win their respective third-round ties.
During their match at the Melbourne Arena, both players mocked Nadal's serving routine after receiving time violations, prompting laughter from the crowd and the umpire.
Kyrgios did his impersonation of the Spaniard in the second set after being penalized for taking too long to serve, brushing his hair back and picking at his shorts whilst looking in the direction of chair umpire Jaume Campistol, who chuckled along.
Simon joined in on the act in the third, again picking at his shorts. Kyrgios doubled over in laughter, while Campistol again couldn't resist cracking a smile.
Kyrgios previously slammed Nadal for his service routine during their meeting at last year's Wimbledon.
Nadal edged a thrilling five-set encounter on Centre Court in the second round, however throughout, Kyrgios was agitated at the Spaniard's lack of speed.
"I'm ready to serve, how long are we going to wait? I'm ready to serve the ball," Kyrgios said during the match, according to Eurosport.
"When he's serving, he's controlling the tempo," he added. "Why do I have to wait for my serve? Why am I waiting? Why? It's too long between serves, it's bull----. It's ridiculous."
The two could now meet in the fourth round in Melbourne.
Kyrgios beat Simon 6-2, 6-4, 4-6, 7-5, to set up a third-round tie with Karen Khachanov on Saturday, whilst Nadal beat Federico Delbonis in straight sets and will Pablo Carreno Busta.
Win those games, and Kyrgios and Nadal will play each other for a place in the quarter-finals.