Stadium: Court 9 Round: 26 Ground: Hardcourt indoor
| Challenger St. Petersburg MD | 2021/03/12 09:35 | De Jong/Verbeek v Karlovskiy E / Serdarusic N | 6-2,7-6 |
| Challenger St. Petersburg MD | 2021/03/11 14:10 | Karlovskiy E / Serdarusic N v Pasha N / Schnur M | 6-7,6-3,10-4 |
| Challenger St. Petersburg MD | 2021/03/10 07:00 | Karlovskiy E / Serdarusic N v Sels J / van Rijthoven T | 6-1,6-2 |
| Challenger St. Petersburg MD | 2021/03/03 14:20 | Gabashvili T / Kravchuk K v Karlovskiy E / Serdarusic N | 6-3,6-4 |
| Challenger Charlottesville MD | 2018/11/01 21:45 | Paes L / Reyes-Varela M v Karlovskiy E / Serdarusic N | 4-6,7-6,13-11 |
| Challenger Charlottesville MD | 2018/10/29 16:55 | Karlovskiy E / Serdarusic N v Lord M / Ross G | 4-6,6-1,10-3 |
| Challenger Charlottesville MD | 2018/10/28 20:20 | Karlovskiy E / Serdarusic N v Choinski J / Majchrzak K | 7-6,6-2 |