Stadion: Court 1 Round: 25 Ground: Clay
| ITF - M25 - Decatur | 2021/08/04 20:30 | Gonzalo Villanueva v Petros Chrysochos | 1-6,3-6 |
| Challenger - Lexington | 2021/07/25 17:00 | Aidan Mchugh v Gonzalo Villanueva | 7-5,2-6,6-3 |
| Challenger - Cary | 2021/07/20 15:00 | Roberto Cid Subervi v Gonzalo Villanueva | 3-6,7-5,6-1 |
| UTR Pro Tennis Series - Atlanta | 2021/07/16 12:00 | Ivan Yatsuk v Gonzalo Villanueva | 6-1,6-4 |
| UTR Pro Tennis Series - Atlanta | 2021/07/15 18:00 | William Mroz Mroz v Gonzalo Villanueva | 3-6,4-5 |
| UTR Pro Tennis Series - Atlanta | 2021/07/12 13:30 | Vazha Shubladze v Gonzalo Villanueva | 6-1,6-2 |
| UTR Pro Tennis Series - Atlanta | 2021/07/10 13:30 | Gonzalo Villanueva v Andrew Rogers | 6-2,3-6,4-5 |
| UTR Pro Tennis Series - Atlanta | 2021/07/08 12:00 | Gonzalo Villanueva v Jorge Panta | 6-3,6-1 |
| ITF - M15 - Parnu | 2021/08/05 07:00 | Peter Goldsteiner v Simone Roncalli | 5-7,0-6 |
| ITF - M15 - Parnu | 2021/08/04 07:00 | Peter Goldsteiner v Alexander Georg Mandma | 7-5,6-0 |
| ITF - M25 - Kottingbrunn | 2021/07/21 11:40 | Peter Goldsteiner v Zsombor Piros | 4-6,1-6 |
| ITF - M25 - Kottingbrunn | 2021/07/20 10:40 | Peter Goldsteiner v Francisco Vittar | 6-3,6-1 |
| ITF - M25 - Kottingbrunn | 2021/07/19 12:25 | Peter Goldsteiner v Martin Zeljenka | 6-4,7-6 |
| ITF - M25 - Kottingbrunn | 2021/07/18 07:30 | Peter Goldsteiner v Ondrej Valek | 6-2,6-2 |
| ITF - M25 - Telfs | 2021/07/13 07:30 | Peter Goldsteiner v Philip Bachmaier | 6-0,3-6,4-10 |
| ITF - M25 - Velenje | 2021/07/09 09:00 | Peter Goldsteiner v Gonzalo Lama | 2-6,4-6 |