With Ostapenko by now having convincingly proven her French Open victory was no fluke, audiences are treated to a classic youth-versus-experience match-up today.
The Latvian tennis hopeful turned 20 just this summer. She was born just after Williams, 37, made her Grand Slam debut at the French Open.
As ever, you will be able to watch the match live on LTV7 and LSM's Latvian service, with coverage expected to start from 16:00 Riga time.