Even the GOAT has regrets—Serena Williams once called her 2004 Olympic withdrawal her career’s biggest disappointment, and it wasn’t even a defeat on court. Forced out by a knee injury, Serena felt she let down Queen Vee, coach Zina, and Team USA. But true to form, she bounced back with Olympic golds in singles and doubles later. How do you rate this as a rivalry moment in the Williams sisters’ legendary partnership? #Sports #Tennis #SerenaWilliams