Stadium: Court 2 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Champaign | 2021/07/26 15:00 | Perez, Alfredo v Bybel, Nicholas | 6-1,6-3 |
| ITF M15 Edwardsville | 2021/07/19 14:00 | Meister, Nicolas v Bybel, Nicholas | 3-6,6-1,10-4 |
| ITF M25 Weston | 2021/06/28 19:00 | Alex Hernandez v Bybel, Nicholas | 6-3,6-1 |
| ITF M15 Champaign | 2021/06/22 15:00 | Farren, Connor v Bybel, Nicholas | 6-4,6-2 |
| ITF M15 Champaign | 2021/06/21 15:00 | Bybel, Nicholas v Parker, Jordan | 6-7,6-2,10-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/14 18:00 | Bybel, Nicholas v Ortlip, Joshua | 3-6,3-6 |
| ITF M25 Wichita | 2021/06/08 15:00 | Matias Soto v Bybel, Nicholas | 7-5,7-6 |
| ITF M25 Wichita | 2021/06/07 15:00 | Lakoseljac, Christian v Bybel, Nicholas | 5-7,5-7 |
| ITF M25 Champaign | 2021/07/26 15:00 | Alexander Brown v Bruno Kuzuhara | 4-6,6-2,6-10 |
| ITF M15 Edwardsville | 2021/07/21 17:20 | Alexander Brown v Takeuchi, Kento (1987) | 6-1,2-6,2-6 |
| ITF M15 Champaign | 2021/06/23 22:30 | Pervolarakis, Michail v Alexander Brown | 6-3,6-0 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/14 18:00 | Alexander Brown v Bryde, Trent | 3-6,0-6 |
| ITF M25 Wichita | 2021/06/09 21:00 | Mcnally, John v Alexander Brown | 6-4,6-2 |
| Challenger Columbus | 2020/02/25 15:00 | Alexander Brown v Haerteis, Johannes | 3-6,6-7 |
| Challenger - Cleveland | 2020/02/10 18:45 | Alexander Brown v Sarmiento, Raymond | 4-6,2-6 |
| Challenger Champaign | 2019/11/16 19:00 | Sebastian Korda v Alexander Brown | 6-2,6-2 |