Alexander Zverev refused to be drawn after a spectator shouted the names of two women, one of whom had settled assault accusations against him, during the Australian Open trophy presentation on Sunday.
The German world No 2 was well beaten in three sets by defending champion Jannik Sinner in the men's singles final in Melbourne.
A woman began shouting out as the 27-year-old Zverev stepped up to give his speech afterwards at Rod Laver Arena. There were a few boos and whistles.
A German court in June dropped a case against the player over allegations he assaulted his ex-girlfriend, after a settlement was agreed hours before he was due to play in the semifinal of the French Open.
Zverev, who has denied wrongdoing, was asked in a post-match news conference to comment about what he heard.
He said: "I believe there are no more accusations. There haven't been for, what, nine months now?
He added: "I think I've done everything I can, and I'm not about to open that subject again."