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.

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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.

"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.

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"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.

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