Davis Cup WG PO: ARG vs COL 2018 ATP
Round robin
| Winner | Loser | Score | |
|---|---|---|---|
| Diego Schwartzman | d. | Santiago Giraldo | 6-3 6-1 6-7(3) 6-1 |
| Guido Pella | d. | Daniel Elahi Galan | 3-6 6-4 4-6 6-3 6-2 |
| Horacio Zeballos | d. | Nicolas Mejia | 7-5 6-2 |
| Winner | Loser | Score | |
|---|---|---|---|
| Diego Schwartzman | d. | Santiago Giraldo | 6-3 6-1 6-7(3) 6-1 |
| Guido Pella | d. | Daniel Elahi Galan | 3-6 6-4 4-6 6-3 6-2 |
| Horacio Zeballos | d. | Nicolas Mejia | 7-5 6-2 |