Dongfeng Race Team continue to lead the fleet from their position furthest south, just seven miles above the Antarctic Ice Exclusion Zone (AIEZ) set by race control.
MAPFRE continued the chase in second 10 miles north, with Vestas 11th Hour Racing filing in around 50 miles behind them.
"Conditions are full on," Vestas 11th Hour Racing helmsman Mark Towill said as the crew reported seeing gusts of 53 knots of wind overnight.
"We've had 30 to 40 knots for 24 hours now – we're rocketing downwind. It's full on Southern Ocean conditions but good fun. We knew what we were coming down here to find, and we've definitely found it."