Denis Istomin partnered Sanjar Fayziev to a 2-6, 6-1, 6-3 win over Nikola Milojevic and Viktor Troicki in the doubles before he downed Dusan Lajovic 6-3, 6-4 in the singles. But Filip Krajinovic picked up the decisive point by coming from behind to beat world number 280 Sanjar Fayziev 4-6, 6-3, 6-0 to nail down a place for Serbia at November's revamped finals in Madrid.
Germany, who won the last of three titles in 1993, eased to victory over Hungary as Jan-Lennard Struff and Tim Puetz strolled to a 6-2, 6-3 doubles triumph to an unassailable 3-0 advantage. Third-ranked Alexander Zverev cruised to a 6-3, 6-4 win over Gabor Borsos in the first reverse singles as the countries opted to play out the remaining dead rubbers in Frankfurt.
Australia romped to a 4-0 rout of Bosnia and Herzegovina in Adelaide, as John Peers and Jordan Thompson clinched the tie with a 7-5, 6-1 defeat of Mirza Basic and Tomislav Brkic in the doubles. Teenager Alexei Popyrin, in his Davis Cup debut, followed up with a 6-1, 7-6 (7/2) win over Nerman Fatic, while the fifth match was not played.
Andreas Seppi guided Italy into the finals of the revamped competition after the 1976 champions dispatched India 3-1. Seppi brushed aside India's number one Prajnesh Gunneswaran 6-1, 6-4 in the first reverse singles tie on Kolkata's grass court after India avoided a whitewash by taking the doubles.
The 12 winners in qualifying this weekend will join automatic qualifiers Croatia, France, United States, Spain, Argentina and Britain in November's finals in Madrid.