Serena Williams vs Daria Gavrilova
Head-to-head: Williams leads 1 0
It's been a somewhat quiet season for Australia's Daria Gavrilova. Since last year's breakthrough, she's succumbed to a string of first and second losses, results at odds with the 22-year-old's big game and even bigger promise. But despite the early exits, Gavrilova's reputation as a giant-killer remains intact - she owns four wins over Top 20 players so far, including victories over Petra Kvitova and halep.
She'll have to bring every ounce of her dogged belief and determination against what would be the biggest opponent of all: World No.1 Serena Williams.