Serena Williams beat her sister Venus in the final to win the Australian Open in January

World number two Serena Williams has appeared to announce on social media that she is pregnant.

The 35-year-old posted a picture of herself on Snapchat posing in a mirror with the message: “20 weeks” before deleting the post.

If confirmed, the American, who won a record 23rd Grand Slam in Australia this January, will miss most of the remaining tennis season.

This includes three Grand Slams – the French Open, Wimbledon and US Open.

Williams, who will return to world number one next week, would be eligible to retain her ranking under the WTA Special Ranking Rule