WATCH: Suni Lee Wins Olympic Gold for United States in Women's All-Around Gymnastics Event After Simone Biles Withdrawal

US gymnast Sunisa "Suni" Lee won gold in the individual all-around event Thursday at the Tokyo Olympics. The 18-year-old gymnast became the fifth straight American to win the competition at the Summer Games. Defending champion and repeat favorite Simone Biles withdrew from the event earlier this week for mental health reasons, leaving a wide open field of competitors. Biles watched and cheered on her teammates from the stands as Lee won the gold medal and her replacement Jade Carey finished eighth in the event.