| Challenger Ochsenhausen | 2019/05/21 10:20 | Josip Huzjak v Gaston Alto | L | 3-0 |
| Challenger Ochsenhausen | 2019/05/21 08:20 | Gaston Alto v Sven Happek | W | 3-0 |
| Challenger Ochsenhausen | 2019/05/20 20:00 | Tomas Konecny v Gaston Alto | W | 1-3 |
| Challenger Ochsenhausen | 2019/05/20 17:20 | Daniel Kleinert v Gaston Alto | L | 3-1 |
| Challenger Ochsenhausen | 2019/05/20 14:40 | Gaston Alto v Lehel Demeter | W | 3-1 |
| Challenger Ochsenhausen | 2019/05/20 10:30 | Gaston Alto v Andrei Putuntica | L | 0-3 |
| Challenger Ochsenhausen | 2019/05/20 08:30 | Gaston Alto v Daniel Gorak | L | 1-3 |
| Croatia Open | 2019/05/15 12:50 | Gaston Alto v Kenji Matsudaira | L | 0-4 |