| Challenger de Estambul | 09/06 08:00 | 27 | [128] Jesper De Jong v Ilia Simakin [471] | 6-7,7-5,6-3 | |
| Challenger de Estambul | 09/05 07:00 | 26 | [471] Ilia Simakin v Gijs Brouwer [226] | 6-0,4-6,6-3 | |
| Challenger de Estambul | 09/03 07:00 | 25 | [471] Ilia Simakin v Jiri Vesely [278] | 6-1,6-4 | |
| Challenger de Estambul | 09/02 07:00 | 19 | Ilia Simakin v S Mert Ozdemir | 4-6,6-1,6-2 | |
| Challenger de Estambul | 09/01 10:45 | 14 | Ilia Simakin v Leonid Sheyngezikht | 6-3,6-1 | |
| ITF M15 Nakhon Si Thammarat | 08/25 02:00 | 29 | Ilia Simakin v Kasidit Samrej | 6-3,6-4 | |
| ITF M15 Nakhon Si Thammarat | 08/24 01:55 | 28 | [475] Ilia Simakin v Jake Delaney [500] | 6-1,6-2 | |
| ITF M15 Nakhon Si Thammarat | 08/23 05:20 | 27 | Ilia Simakin v Leo Borg | 6-0,6-4 | |
| ITF M15 Nakhon Si Thammarat | 08/22 03:30 | 26 | [475] Ilia Simakin v Nitin Kumar Sinha [435] | 6-2,6-4 | |
| ITF M15 Nakhon Si Thammarat | 08/21 03:00 | 25 | Ilia Simakin v Credit Chaiyarin | 6-2,6-1 | |
| ITF M25 Astana | 07/24 06:55 | 25 | Amir Omarkhanov v Ilia Simakin | 6-4,4-6,6-2 | |
| Challenger de Astana | 07/18 05:00 | 26 | Ilia Simakin v Lukas Pokorny | 6-7,2-6 |
Ilia Simakin (born 27 October 2003) is a Russian tennis player.
Simakin has a career high ATP singles ranking of 465 achieved on 22 July 2024. He also has a career high ATP doubles ranking of 268 achieved on 5 August 2024.
Simakin has won 1 ATP Challenger doubles title at the 2024 President's Cup with Egor Agafonov.