Serena Williams was 17 years old when she won the US Open for the first time, in 1999.

Quick Scoop: Serena’s First US Open Title

  • Serena won her first US Open singles title in 1999.
  • She was 17 years old at the time, making her one of the youngest champions in the tournament’s modern era.
  • That 1999 victory was also her first Grand Slam singles title, kicking off a legendary career that would eventually include 23 major singles trophies.

In 1999, a 17-year-old Serena Williams stormed through the draw in New York and lifted the US Open trophy, signaling the start of a new era in women’s tennis.

TL;DR: Serena Williams was 17 years old when she won the US Open. Information gathered from public forums or data available on the internet and portrayed here.