By Jack Ryan

Defending American women’s tennis gold medalist Serena Williams saw her repeat hopes come to an early and surprising end as she got bounced in straight sets by Ukraine’s Elina Svitolina in the Round of 16.

With an erratic performance in Rio and various injuries this season, it’s possible the 35-year-old Williams was just too exhausted to make a run.

If you’re still looking for an American to cheer on, 21-year old Madison Keys pulled into the quarterfinals with a three-set victory against Spain’s Carla Suarez Navarro.