Alexander Zverev shrugged off a tight loss to Novak Djokovic to end Serbia's ATP Cup title defence with victory in the doubles as Germany advanced to the semi-finals of the team-based event in Melbourne on Friday.
A year after crashing out of the inaugural ATP Cup with a huge tally of double-faults, Alexander Zverev's serving demons returned under pressure at Rod Laver Arena when he was broken twice late in the deciding set.
Uncharacteristically, Djokovic also dropped serve when looking to close out the match but made no mistake on his second chance, as Zverev conceded with a backhand that sailed long.
Too rusty, too tired? Alcaraz, Ruud fail to hit US Open heights in shock losses
"I thought it was a great match. I thought we both played well," Djokovic said on court after extending his unbeaten record to 11-0 at the ATP Cup.
"He definitely had a big serving match. It was so difficult to play against him today.
The Australian Open is live on Eurosport. Watch every match live and ad-free on the Eurosport app and You can download the Eurosport app for iOS and Android now.
"Obviously in the last couple of games we were both quite tight."
Zverev, beaten 6-7(3) 6-2 7-5 in a high-quality match by world number one Djokovic earlier on Friday, stepped up to partner Jan-Lennard Struff to a rousing 7-6(4) 5-7 (10-7) victory over Djokovic and Nikola Cacic on Rod Laver Arena.
The winners will join Spain, Russia and Italy in the semi-finals.
With Rafa Nadal still sidelined with a back problem, Pablo Carrena Busta guided a depleted Spain into the last four by claiming a 6-3 6-4 win against Greece’s Michail Pervolarakis at John Cain Arena.
Though eliminated, Greece ended up winning the tie 2-1, with Stefanos Tsitsipas easing past Roberto Bautista Agut 7-5 7-5.
Spain retired after losing the opening game of the doubles, handing Greece the win.

Trailblazers - The inspiring story of Serena Williams

Nadal v Djokovic: Who could break Federer's one-surface title record?
Six matches we want to see before end of 2022 tennis season