Stadium: Centre Court Round: 26 Ground: Clay
| Challenger Porto MD | 2021/07/01 15:35 | Galloway R / Lawson A v Istomin/Yevseyev | 7-5,6-3 |
| Challenger Porto MD | 2021/06/30 10:00 | Istomin/Yevseyev v Cacao T / Falcao G | 6-2,7-5 |
| Challenger Almaty MD | 2021/06/09 12:30 | Istomin/Yevseyev v Manafov V / Tiurnev E | 3-6,2-6 |
| Challenger Nur-Sultan MD | 2021/03/02 09:55 | Lammons/Withrow v Istomin/Yevseyev | 6-1,4-6,10-7 |
| Challenger Nur-Sultan MD | 2021/02/26 06:40 | Istomin/Yevseyev v Pasha N / Schnur M | 6-4,1-6,9-11 |
| Challenger Nur-Sultan MD | 2021/02/25 11:30 | Istomin/Yevseyev v Polansky P / Schnur B | 6-0,6-3 |
| Challenger Nur-Sultan MD | 2021/02/23 11:00 | Silva/Machac v Istomin/Yevseyev | 6-3,5-7,7-10 |