Bernard Tomic has ruled himself out of the Rio Olympics because of an "extremely busy" schedule - and will play at an ATP event in Mexico instead.
Tomic and Nick Kyrgios had been warned by Australia's Olympic team boss that their behaviour was being monitored in the build-up to this summer's Games.
Tomic, 23, was criticised for holding his racquet by the strings when facing a match point at the Madrid Open.
He says he made himself unavailable for Rio "with a heavy sense of regret".
The world number 22 added: "On the basis of my extremely busy playing schedule and my own personal circumstances, I am regrettably unable to commit to this year's tournament.