Serena Williams is back on court training after her tearful exit from the Australian Open in which she hinted at retirement

• Serena Williams is back on the court training after her tearful exit from the Australian Open last month.
• Williams posted a video to her Instagram of her practicing with Grigor Dimitrov on Sunday.
• Dimitrov also posted a similar video, saying: "My practice partner is better than yours."

Serena Williams is back on the court training after her tearful exit from the Australian Open in which she hinted she could be ready to retire.

The 39-year-old was beaten by eventual winner Naomi Osaka in the semifinals of the tournament last month.

After the match, she saluted the crowd as she left the Rod Laver Arena before breaking down in tears in her post-match press conference, saying: "If I ever say farewell, I wouldn't tell anyone."

However, Williams' tennis journey appears not to have come to an end just yet.

On Sunday, she posted a video of her practicing with men's world No.17 Grigor Dimitrov. "Just a casual hit," she said on Instagram.

Dimitrov also posted a similar video to his own Instagram, saying: "My practice partner is better than yours."

Serena's sister Venus seemed to be disappointed at being left out of the fun, commenting on the Bulgarian's post: "Omg are you guys hitting now? Where is my invite?"

Serena's exit from the Australian Open saw her miss out on winning her 24th Grand Slam, which would have moved her level with Margaret Court in the all-time record books.

Former world No.2 Tommy Haas recently told Insider that while Williams have may hinted at retirement following the defeat to Osaka, he believes she won't stop until she surpasses Court.

"23 Grand Slams is almost the record," Haas said. "I know deep down as the competitor she is she wants to break the record.

"I think ultimately that's why she's still playing because she wants that number and she's going after it."