[196] Jeffrey John Wolf 6-2,3-6,5-7 Stefan Kozlov [301] 2021-09-25 16:00
Stadium: Court 1 Round: 28 Ground: Hardcourt indoor
Head to Head
| Challenger Champaign | 2019/11/15 16:00 | Stefan Kozlov v Jeffrey John Wolf | 2-6,2-6 |
| Challenger Columbus | 2019/01/07 19:00 | Jeffrey John Wolf v Stefan Kozlov | 6-2,7-6 |
| ITF USA F13 | 2016/04/13 23:00 | Jeffrey John Wolf v Stefan Kozlov | 1-6,3-6 |
Home History
| Challenger Columbus | 2021/09/24 17:40 | Tennys Sandgren v Jeffrey John Wolf | 3-6,6-3,6-7 |
| Challenger Columbus | 2021/09/23 16:20 | Evan King v Jeffrey John Wolf | 3-6,0-6 |
| Challenger Columbus | 2021/09/21 18:10 | Mukund Sasikumar v Jeffrey John Wolf | 3-6,2-6 |
| US Open | 2021/08/26 15:00 | Kamil Majchrzak v Jeffrey John Wolf | 6-3,7-6 |
| US Open | 2021/08/24 15:00 | Jeffrey John Wolf v Denis Istomin | 7-5,6-2 |
| ATP Cincinnati | 2021/08/14 20:35 | Jeffrey John Wolf v Marcos Giron | 3-6,3-6 |
| ATP Toronto | 2021/08/07 18:10 | Frances Tiafoe v Jeffrey John Wolf | 6-2,0-6,6-4 |
| ATP Washington | 2021/08/01 21:05 | Jeffrey John Wolf v Elias Ymer | 6-7,6-7 |
Away History
| Challenger Columbus | 2021/09/24 15:00 | Mikael Torpegaard v Stefan Kozlov | 6-2,6-7,4-6 |
| Challenger Columbus | 2021/09/23 15:00 | Jason Kubler v Stefan Kozlov | 2-6,5-7 |
| Challenger Columbus | 2021/09/21 19:45 | Stefan Kozlov v Mitchell Krueger | 6-0,6-3 |
| Challenger Kyjev | 2021/09/06 12:00 | Franco Agamenone v Stefan Kozlov | 6-4,7-5 |
| Challenger Mallorca | 2021/09/02 16:25 | Stefan Kozlov v Fernando Verdasco | 6-1,6-7,2-6 |
| Challenger Mallorca | 2021/08/31 12:55 | Daniel Rincon v Stefan Kozlov | 3-6,6-1,1-6 |
| US Open | 2021/08/24 15:00 | Bernabe Zapata Miralles v Stefan Kozlov | 7-5,1-6,6-3 |
| Challenger Lexington | 2021/07/29 20:00 | Stefan Kozlov v Alejandro Tabilo | 2-6,2-6 |