Tennis legend Serena Williams made a tearful exit from a press conference after losing to Naomi Osaka in the Australian Open semi-finals.

Osaka defeated Williams 6-3 6-4 in a match that only lasted 75 minutes.

Rumours were flying as Williams made an emotional exit after the loss by putting her hand on her heart and waving goodbye to the crowd at Rod Laver Arena.

“I don’t know. If I ever say farewell, I wouldn’t tell anyone, so...” she said, keeping quiet.

The press conference quickly turned as a reporter asked about her performance against Osaka.

“The unforced errors through the match, considering how well you played to get to this stage, what do you feel caused that? Was it just one of those bad days at the office?” he asked.

Williams barely responded and she began tearing up, leaving the room and ending her press conference early.

“I don’t know. I’m done,” she said, getting out of her seat as she finished speaking.

Before Williams' departure, she admitted unforced errors were the difference in winning the match.

“Honestly, it was opportunities where I could have won. I could have been up five-love. I just made so many errors,” Williams said.