Auger-Aliassime beats Djokovic to put Team World on brink of victory
Auger-Aliassime produced a masterful performance at a packed O2 Arena, holding off a Djokovic comeback in the second set to clinch Team World's second victory of the day.
Earlier, Auger-Aliassime and Jack Sock had come from a set down to beat Andy Murray and Matteo Berrettini 2-6 6-3 10-8.
Europe begun the day with an 8-4 lead going into the last four matches of the weekend but with a win rewarded by three points on the final day there was the potential for a big swing.
Serbian Djokovic had been imperious the previous evening on his return to action for the first time since winning Wimbledon in July to reach 21 Grand Slam titles.
He thrashed Frances Tiafoe and won a doubles with Berrettini, but Auger-Aliassime carried the momentum of his doubles win into the singles.
The Canadian broke Djokovic's serve twice in the opening set and led 3-1 in the second before the former world number one, with Roger Federer supporting from the sidelines, began to find his range to drag the set into a tiebreaker.
But Djokovic's level dropped and Auger-Aliassime took advantage to record his first career win over the Serbian.
Tiafoe can give Team World an unassailable lead if he beats Stefanos Tsitsipas in the penultimate match.
If Greek Tsitsipas wins, everything will be decided in the final singles between Norway's Casper Ruud and American Taylor Fritz.
Should Team World, captained by John McEnroe, come out victorious it would be a massive turnaround after they lost 14-1 last year in Boston.