Germany's Alexander Zverev saved two match points against Hubert Hurkacz to prevail 6-7(3) 7-6(6) 6-4 and level their United Cup mixed team tournament final against Poland at 1-1 on Sunday after Iga Swiatek outclassed Angelique Kerber 6-3 6-0.
Hurkacz was pushed hard by Zverev in a physically demanding opening set of his contest but the big-hitting world number nine edged the tie-break to give Poland hope of sealing a swift win for their first team title.
But Zverev saved two match points, including one with a sublime forehand pass to the back of the court at 6-4 down in the second set tie-break, before dragging himself back into the contest as Hurkacz struggled to stem the flow of errors.
The gutsy German moved ahead 4-3 with a break in the decider despite looking drained at times but kept up the pressure to win an epic encounter lasting nearly three hours on his second match point to force a mixed doubles decider.
World number one Swiatek earlier stepped up preparations for the Australian Open starting next Sunday by fending off Kerber after a high-quality start by both players.
The four-times Grand Slam champion moved up a gear in the opening set as Kerber, who returned to action in the tournament after 18 months on maternity leave, dropped her level having gone toe to toe with her opponent until 3-3.
The 22-year-old Swiatek looked unstoppable in the second set and she wrapped up the win in 70 minutes.
Sanju Samson has struggled for form since being named Player of the Tournament at the T20 World Cup but the wicketkeeper-batter looked more like his old self on Saturday with an unbeaten 115 off 56 balls in Chennai's 23-run win over Delhi Capitals.
Rory McIlroy discovered again on Saturday that nothing at the Masters is secure as the defending champion's overnight six-shot advantage vanished in the Georgia heat and Cameron Young charged into a share of the lead at 11-under after the third round.
Belgium knocked out 18-times champions the US to qualify for the Billie Jean King Cup Finals on Saturday, as Britain, Italy, Kazakhstan, Spain, Ukraine and Czech Republic also secured places in the season-ending team event alongside hosts China.
Liverpool's teenage winger Rio Ngumoha has become the club's youngest player to score a Premier League goal at Anfield on Saturday before Mohamed Salah struck four minutes later in a 2-0 win over Fulham that boosted their quest for a top-five finish.
Britain's former heavyweight world champion, Tyson Fury, has outclassed Russia's Arslanbek Makhmudov en route to a comprehensive points win on Saturday and then called for a showdown with compatriot Anthony Joshua.