Spain's Carlos Alcaraz sealed a straight-set win against American Taylor Fritz to lead Team Europe to a 13-11 victory at the Laver Cup in Berlin.
Team World had led 11-7 going into the penultimate match in the first-to-13 competition.
But with three points available for each win on day three, German Alexander Zverev's 6-7 (5-7) 7-5 10-5 win over American Frances Tiafoe reduced World's lead to a single point and forced a deciding match.
Alcaraz, who criticised the congested tennis schedule on Saturday, completed the thrilling comeback with a 6-2 7-5 triumph.