The German tennis pros reached the final tournament of the Davis Cup in November in Malaga early in Hamburg.
The hosts also won their second intermediate round game 2-1 against Belgium on Friday.
Kevin Krawietz from Coburg and Frankfurt’s Tim Pütz provided the decisive second point in doubles with 4: 6, 6: 2, 7: 6 (7: 5) against Sander Gille and Joran Vliegen.
Just like on Wednesday against France, Jan-Lennard Struff from Warstein had given his team a 6-4, 7-5 (11-9) lead against Zizou Bergs.
Oscar Otte from Cologne then lost to David Goffin 6:3, 6:7 (7:9), 3:6.
In the last encounter on Sunday (2:00 p.m. / ServusTV and DAZN) against the Australians, who have also already qualified, the only thing left is to win the group.