Venue: Flushing Meadows, New York, Date: Saturday, 12 September
Coverage: Live commentary on BBC Radio 5 live sports extra, BBC Sport website and BBC Sport app from 20:00 BST.
Serena Williams fell victim to one of the biggest shocks in tennis history at the US Open, said two-time champion Tracy Austin.
Williams, 33, was two wins from completing the calendar Grand Slam but lost 2-6 6-4 6-4 to unseeded Italian Roberta Vinci in the semi-finals.
"This is monumental. It's a shocker," Austin told BBC Sport.
"This is one of the biggest upsets in the history of tennis, because of what was on the line.