And with her supercoach Lindsay Davenport of the USA looking on Saturday, the 19 year old Keys stunned the Wimbledon champion and 4th seeded Petra Kvitova of the Czech Republic 6-4, 7-5 in the third round.
Williams takes on the 6th seeded Agnieszka Radwanska of Poland at 7:00 PM Melbourne time (12:00AM PST USA) in a much anticipated match that could be interrupted by nearby Australia Day fireworks exploding overhead.
The 34 year old Williams won three games in a row to come back from a 4-6, 3-5 deficit against Giorgi with powerful groundstrokes and serves.
Radwanska can mix placement and touch to keep the ball in play longer to draw more errors from Williams today however. But I think Williams will have a good day and hit more winners than errors and have a fast start for a three set upset win.
Madison Keys faces her fellow American and namesake Madison Brengle at an estimated 4:30 PM Melbourne time (10:30 PM PST USA).
Keys has improved her movement and consistency from 2014 to 2015 and should overpower Brengle from the baseline for a straight sets win.