Serena Williams is returning to professional tennis at age 44 after nearly four years away from the sport.

The 23-time Grand Slam singles champion has accepted a wild card invitation to play doubles at the upcoming Queen’s Club grass-court tournament in London, the WTA Tour announced Monday.

Williams also made a post on social media with the caption, “Guess everybody heard the news.” The post had a video with her phone ringing, during which she said, “I gotta change my number.”

The Queen’s Club tournament starts next Monday and the WTA said Williams will play “with a partner to be announced in due course.”

A return on grass will raise speculation that Williams also plans to compete at Wimbledon, which starts June 28. She’s won seven singles titles at the All England Club.