Despite a few snags in the first set, a fired-up Serena Williams dominated Australia’s unseeded Daria Gavrilova in her Rio Olympics debut.
The current World No. 1 and four-time Olympic gold medalist needed some time to warm up in the first set, trading points with her 22-year-old opponent. Williams, 34, finally kicked into high gear after losing a particularly long rally. Using more aggressive tactics, she took the first set 6-4.
Williams hit the ground running in the second set, fending off Gavrilova’s tricks while sister Venus watched from the stands.
Final score: 6-4, 6-2.
No. 5 seed Venus lost a three-hour, three set singles match on Saturday night to Belgium’s Kirsten Flipkens. She was reportedly suffering from illness, but her health has improved enough to compete on Sunday. The siblings will go for their fourth consecutive doubles gold medal this afternoon on court 1.
NBCOlympics.com will provide further coverage as the events unfold. Live streams are available on the schedule page.