Stadium: Grandstand Round: 27 Ground: Clay
| Challenger Milan MD | 2021/06/23 13:15 | King/Reese v Bonadio/Gabashvili | 6-7,6-7 |
| Challenger Milan MD | 2021/06/23 15:00 | Brancaccio R / Zeppieri G v Walkow S / Zielinski J | 6-7,4-6 |
| Challenger - Aix en Provence - Doubles Hommes | 2021/06/18 15:40 | Walkow S / Zielinski J v Doumbia/Reboul | 6-7,4-6 |
| Challenger - Aix en Provence - Doubles Hommes | 2021/06/17 09:00 | Walkow S / Zielinski J v Lamasine T / Olivetti A | 6-4,7-5 |
| Challenger - Aix en Provence - Doubles Hommes | 2021/06/16 11:20 | Matos/Molchanov v Walkow S / Zielinski J | 0-6,7-6,8-10 |
| Challenger - Lyon - Doubles Hommes | 2021/06/11 13:30 | Walkow S / Zielinski J v Cuevas M / Cuevas P | 6-7,7-6,8-10 |
| Challenger - Lyon - Doubles Hommes | 2021/06/10 15:30 | Blanchet U / Jacquet K v Walkow S / Zielinski J | 6-7,2-6 |
| Challenger - Lyon - Doubles Hommes | 2021/06/08 08:00 | Drzewiecki/Martos Gornes v Walkow S / Zielinski J | 6-4,5-7,7-10 |
| Challenger Zagreb - Doubles Hommes | 2021/05/14 13:00 | Golubev A / Nedovyesov A v Walkow S / Zielinski J | 7-6,6-4 |