Serbia is through to the Davis Cup quarter-finals as one of the two best runners-up in group stage.
Germany prevailed in their opening tie in Group F of the Davis Cup by Rakuten Finals, winning 2-1 over Serbia on Saturday evening.
In the first singles match of the day, Dominik Koepfer beat Filip Krajinovic 7-6, 6-4.
Playing his 50th Davis Cup match, world no.1 Novak Djokovic defeated Jan-Lennard Struff in straight sets, 6-2, 6-4, to level up the Davis Cup tie in Innsbruck, Austria.
Novak cruised to the victory in 72 minutes, breaking twice in the first set and once in the second.
Match statistics: aces (9-2), double faults (0-1), winners (15-7), unforced errors (8-10), total points won (64-46).
In the decisive doubles rubber, Kevin Krawietz and Tim Puetz overcame Novak and Nikola Cacic 7-6 (5), 3-6, 7-6 (5) in two hours and 16 minutes to seal a 2-1 victory for Germany.
The 2010 champions advance into the quarter-finals as one of the two best second-placed teams together with the six group winners.
The quarter-final line-up:
Italy vs Croatia (November 29)
Great Britain vs Germany (November 30)
Serbia vs Kazakhstan (December 1)
RTF vs Sweden (December 2)