Stadium: Court 4 Round: 26 Ground: Clay
| ITF M15 Melilla | 2021/09/24 09:00 | Merida Aguilar, Daniel v Mesquida Berg, Oscar | 7-5,3-6,3-6 |
| ITF - M25 Pensacola | 2021/05/20 14:30 | Mesquida Berg, Oscar v Peter Bertran | 4-6,1-6 |
| ITF - M25 Pensacola | 2021/05/19 16:50 | Nick Chappell v Mesquida Berg, Oscar | 5-7,6-4,3-6 |
| ITF - M25 Pensacola | 2021/05/18 16:05 | Juncheng Shang v Mesquida Berg, Oscar | 5-7,5-7 |
| ITF - M25 Pensacola | 2021/05/17 15:00 | Strother, Caleb v Mesquida Berg, Oscar | 5-7,0-6 |
| Fayetteville, AR, Singles Qualifying, M-ITF-USA-31 | 2020/11/02 17:30 | Joshua Sheehy v Mesquida Berg, Oscar | 7-6,3-6,10-8 |
| ITF M15 Cancun | 2020/03/11 14:00 | Estevez Maximiliano v Mesquida Berg, Oscar | 6-2,6-3 |
| ITF M15 Cancun | 2020/03/09 15:00 | Martinez Sarrasague, Felipe v Mesquida Berg, Oscar | 4-6,3-6 |
| ITF M15 Melilla | 2021/09/24 10:00 | Aaron Cohen v Diego F Flores | 3-6,6-4,3-6 |
| ITF M25 Sintra | 2021/09/15 11:55 | Yuta Shimizu v Diego F Flores | 6-2,6-7,6-2 |
| ITF M25 Sintra | 2021/09/14 13:15 | Diego F Flores v Hans Albert Schubert | 6-2,6-3 |
| ITF M25 Sintra | 2021/09/13 15:05 | Diego F Flores v Jaime Faria | 6-3,6-2 |
| ITF M25 Sintra | 2021/09/07 08:30 | Diego F Flores v Daniel Little | 6-4,0-6,6-10 |
| ITF M25 Sintra | 2021/09/06 10:05 | Diego F Flores v Gleeson, Alan | 6-3,6-3 |
| ITF M15 Bratislava | 2021/08/24 10:00 | Kirkov, Vasil v Diego F Flores | 6-3,6-3 |
| ITF M15 Bratislava | 2021/08/19 08:00 | Diego F Flores v Mate Valkusz | 2-6,6-2,5-7 |