| Rio de Janeiro: Brazil – Germany 1: 3 |
| Monteiro – Struff 6:3, 1:6, 6:3 |
| Meligeni, Soares – Krawietz, Pütz 6:4, 6:7 (4:7), 4:6 |
| Monteiro – A. Zverev 1:6, 5:7 |
| Reno: USA – Colombia 3: 0 |
| Repeat – Mejia 6: 4, 1: 6, 6: 4 |
| Fritz – González 6:1, 6:0 |
| Ram, Sock – Barrientos, Cabal 6:3, 6:4 |
| Sydney: Australia – Hungary 3: 2 |
| Peers, Saville – Marozsán, Valkusz 4: 6, 4: 6 |
| De Minaur – Fucsovics 7: 6 (7: 4), 6: 4 |
| Kokkinakis – Piros 6: 4, 6: 4 |
| Seoul: Korea – Austria 3: 1 |
| Nam -i-song, Song Min-kjo – Erler, Miedler 6: 4, 6: 3 |
| Kwon Sun – Novak 7: 5, 7: 5 |
| Marbella: Spain – Romania 3: 1 |
| Davidovich, Martinez – Copil, Tecau 6: 7 (2: 7) |
| 4: 6, Baptist — Child 6: 2, 6: 3 |
| The Hague: Netherlands – Canada 4: 0 |
| Koolhof, Middelkoop – Polansky, Schnur 7: 5, 6: 3 |
| Haase-Ten 6:1, 6:2 |
| Paris: France – Ecuador 4: 0 |
| Herbert, Mahut-Escobar, Hidalgo 6:3, 7:5 |
| Bonzi – March 6:0, 6:2 |
| Espoo: Finland – Belgium 2: 3 |
| Heliövaara, Ruusuvuori – Gille, Goffin 6: 3, 2: 6, 7: 6 (7: 5) |
| Mount of Roses – Goffin 4: 6, 2: 6 |
| Virtanen – Bergs 4: 6, 0: 6 |
| Helsinborg: Sweden – Japan 3: 2 |
| Goransson, E. Ymer – McLachlan, Learning 2: 6, 7: 6 (9: 7), 7: 5 |
| Madaras — Daniel 0: 6, 5: 7 |
| E. Ymer – Revelation 6: 3, 6: 3 |
| Oslo: Norway – Kazakhstan 1: 3 |
| Bratholm, Durasovic – Golubjov, Nedovjesov 6: 7 (10:12), 3: 6 |
| Ruud – Bublik 4:6, 7:5, 4:6 |
| Bratislava: Slovakia – Italy 2: 3 |
| Polášek, Zelenay – Bolelli, Sinner 6: 3, 1: 6, 7: 6 (7: 3 |
| Horansky – Sinner 5: 7, 4: 6 |
| Gombos – Musetti 7: 6 (7: 3), 2: 6, 4: 6 |
