Serena Williams is moving on from the sport she's dominated for decades -- the superstar just announced she's "evolving away" from tennis after the U.S. Open.
The 40-year-old shared the news in an essay with Vogueon Tuesday ... saying it's time to move on and focus on other challenges -- raising a family and business ventures off the court.
"I’m terrible at goodbyes, the world’s worst," Williams said. "But please know that I am more grateful for you than I can ever express in words. You have carried me to so many wins and so many trophies."
Her off-court ventures have proven to be just as successful -- in 2009, Serena and Venus became minority owners of the Miami Dolphins, making them the first black women to hold any ownership of an NFL team.
Serena is also one of the owners of the Angel City FC soccer team ... and earlier this year, committed millions in hopes of helping a big do buy Chelsea FC in London.
Recently, Williams started Serena Ventures, which raised $111 million in outside funding this year.
A movie about the Williams sisters' upbringing, "King Richard," was released in 2021 to positive reviews ... and earned Will Smith an Oscar for his portrayal of their father, Richard. Both sisters were executive producers for the flick.
"Believe me, I never wanted to have to choose between tennis and a family," she added. "I don’t think it’s fair. If I were a guy, I wouldn’t be writing this because I’d be out there playing and winning while my wife was doing the physical labor of expanding our family. Maybe I’d be more of a Tom Brady if I had that opportunity."
The U.S. Open kicks off at the end of the month ... and it will truly be the end of an era.