Watch: Serena Williams returns to US Open - as a fan

Serena Williams attended the U.S. Open for the first time since retiring, making a lively appearance at Flushing Meadows. The 23-time Grand Slam winner interacted with players, watched matches, and was a bridesmaid at Caroline Wozniacki's wedding. Wozniacki acknowledged Williams' energetic and supportive nature, celebrating their friendship.