Kyrgios’s allegation was then repeated by Kokkinakis, who cited the Ultimate Fighting Championship in his own Twitter message: “That was crazy!! Mans thought it was @ufc”.

In the interview room after the Croatians’ shock 7-6, 6-3 defeat, Pavic had complained about the boisterous fans in the Kia Arena. “They are pretty loud,” he said. “Obviously they cheer for Aussies. It wouldn’t hurt them to show some respect to all opponents, to other players.

“We saw yesterday also with Medvedev how it was,” Pavic added. “So, yeah, I mean, that’s how they are here. We’re used to that. But like I said, yeah, it wouldn’t hurt them to show some respect.”

The Croatian pair and the fitness trainer are yet to comment on what Kyrgios alleges took place. 

Kyrgios has inspired some unusual displays of support from local fans this weeks, with the peculiar cry of “Siuuu” – a reference to the sound that Cristiano Ronaldo makes when he scores – ringing out around the stands.

Medvedev – who beat Kyrgios in four sets on Thursday – was caustic after the match about the way some fans had been making that noise between his first and second serves.

“It’s not everybody who is doing it,” he told Eurosport, “but those who are doing it probably have a low IQ.”