Stadium: Hard Court Central Round: 29 Ground: Hardcourt outdoor
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/25 11:45 | Hua R / Zhang Z v Mochizuki/Niki | 6-3,6-1 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/06/04 12:00 | Hua R / Zhang Z v Alvarez Varona/Alves | 7-6,6-3 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/06/03 13:05 | Hua R / Zhang Z v Donski/Moeller | 6-4,3-6,10-4 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/06/01 12:10 | Hua R / Zhang Z v Trongcharoenchaikul/Wattanakul | 4-6,6-1,10-6 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/28 11:35 | Hua R / Zhang Z v Cash/Stalder | 6-7,3-6 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/27 13:10 | Hua R / Zhang Z v Caripi/Stevenson | 6-3,6-4 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/25 11:45 | Hua R / Zhang Z v Mochizuki/Niki | 6-3,6-1 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/22 12:00 | Hua R / Zhang Z v Chrysochos/Whitehouse | 6-4,2-6,6-10 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/21 10:00 | Hua R / Zhang Z v Blanchet U / Darras M | 7-5,2-6,10-7 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/06/04 10:00 | Mochizuki/Niki v Thanos A / Tsitsipas P | 6-4,5-7,13-11 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/06/03 11:15 | Mochizuki/Niki v Cash/Stalder | 4-6,7-5,10-4 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/06/01 10:05 | Kountourakis/Kypriotis v Mochizuki/Niki | 2-6,1-6 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/25 11:45 | Hua R / Zhang Z v Mochizuki/Niki | 6-3,6-1 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/20 12:05 | Mochizuki/Niki v Johnson/Vivero Gonzalez | 5-7,5-7 |
| ITF - M15 Héraklion - Doubles Hommes | 2021/05/18 12:30 | Mochizuki/Niki v Hajek/Little | 6-2,4-6,10-5 |