The Australian Open account shared a clip of the training session, saying: “Welcome back @janniksinner and @cruzhewitt.” Kyrgios commented on Cruz’s post: “Love ya Cruz but this is wild”, adding “Cooked post” with a needle emoji. He also wrote: “Thought we were boys” with several broken heart emojis.

Kyrgios' response comes hot on the heels of his outrage over recent doping scandals involving World No.1 players Sinner and Iga Swiatek. Sinner twice tested positive for an anabolic steroid in March last year, but avoided a ban because the ITIA determined he was not to blame for the substance entering his system.