Sebastian Ofner's best performance at a Grand Slam is a fourth-round showing at the 2023 French Open
Sebastian Ofner made a sorry exit from Australian Open qualifying after forgetting the rules and celebrating victory early - before going on to lose the match.
The Austrian thought he had clinched victory over Nishesh Basavareddy at 7-1 in the third-set tie-break and raised his arms in celebration, pointing at his head as he walked towards the net to shake hands with his American opponent.
However, final-set tie-breaks are played to 10 points, meaning he still needed another three points to win.
Ofner only realised his mistake when the umpire briefly spoke to him.
