| date | Pair 1 | sets | Pair 2 | set 1 | set 2 | set 3 | 
| Mon 15.07.19 | Oliver Marach / J Melzer |  AUT |  AUT | 1 | 2-0 | P Sousa / Stefano Travaglia |  POR |  ITA |  | 6-2 | 7-62 |  | 
| Mon 15.07.19 | N Cacic / Dusan Lajovic |  SRB |  SRB |  | 2-1 | Ariel Behar / N Lammons |  URU |  USA |  | 5-7 | 6-2 | 11-9 | 
| Mon 15.07.19 | Leonardo Mayer / Andres Molteni |  ARG |  ARG | 4 | 2-0 | Fabricio Neis / C Stebe |  BRA |  GER |  | 6-4 | 6-1 |  | 
| Mon 15.07.19 | T Brkic / A Pavic |  BIH |  CRO | WC | 2-0 | Hans Podlipnik-Castillo / T Weissborn |  CHI |  AUT |  | 6-2 | 6-2 |  | 
| Mon 15.07.19 | Antonio Sancic / N Serdarusic |  CRO |  CRO | WC | 2-0 | D Altmaier / Rudolf Molleker |  GER |  GER | ALT | 7-5 | 6-3 |  | 
| Mon 15.07.19 | Denys Molchanov / Igor Zelenay |  UKR |  SVK | 3 | 2-0 | Pablo Andujar / Gerard Granollers |  ESP |  ESP |  | 6-2 | 6-2 |  | 
| Mon 15.07.19 | Simone Bolelli / Fabio Fognini |  ITA |  ITA |  | 2-1 | Thomas Fabbiano / Paolo Lorenzi |  ITA |  ITA |  | 6-75 | 6-1 | 10-8 | 
| Mon 15.07.19 | Robin Haase / Philipp Oswald |  NED |  AUT | 2 | 2-1 | Andrey Rublev / Andrei Vasilevski |  RUS |  BLR |  | 4-6 | 7-5 | 16-14 |