| M25 Chennai | 01/14 06:00 | - | Madhwin Kamath v Ilia Simakin | 1-6,1-6 | |
| Challenger Manama | 11/30 12:00 | 29 | [329] Toby Samuel v Ilia Simakin [281] | 6-0,6-2 | |
| Challenger Manama | 11/29 10:00 | 28 |
[330] Hurrikaani
v
Ilia Simakin [281] |
6-1,6-7,3-6 | |
| Challenger Manama | 11/28 10:00 | 27 | [336] Ivan Marrero Curbelo v Ilia Simakin [281] | 3-6,6-3,1-6 | |
| Challenger Manama | 11/26 07:00 | 26 | [495] Eero Vasa v Ilia Simakin [281] | 4-6,1-6 | |
| Challenger Manama | 11/25 10:10 | 25 | Aleksandre Bakshi v Ilia Simakin | 1-6,2-6 | |
| Challenger Soma Bay | 11/17 12:55 | 25 | [436] Toby Samuel v Ilia Simakin [277] | 6-4,6-4 | |
| ITF M25 Manama | 11/13 08:00 | - | Ilia Simakin v Nikita Bilozertsev | 4-6,1-5 | |
| ITF M25 Manama | 11/11 09:30 | - | Ilia Simakin v Richard Antoni | 6-2,6-2 | |
| Challenger Monastir | 10/29 10:00 | 26 | [276] Ilia Simakin v Petr Brunclik [379] | 4-6,4-6 | |
| Challenger Monastir | 10/27 13:45 | 25 |
[276] Ilia Simakin v
Max Houkes
[272]
|
6-2,6-3 | |
| Challenger Suzhou | 10/23 03:00 | 26 | [245] Frederico Ferreira Silva v Ilia Simakin [254] | 7-5,6-2 | |
| Challenger Suzhou | 10/21 10:10 | 25 |
[254] Ilia Simakin v
Sho Shimabukuro
[195]
|
Retired | |
| ATP Almaty | 10/11 06:00 | 14 |
[256] Ilia Simakin v
Ugo Blanchet
[151]
|
3-6,7-6,6-7 | |
| Challenger Guangzhou | 09/09 07:05 | 25 |
[215] Gauthier Onclin
v
Ilia Simakin [251] |
6-2,6-4 | |
| Challenger Shanghai | 09/04 08:10 | 26 |
[236] Ilia Simakin v
Yasutaka Uchiyama
[225]
|
0-6,4-6 | |
| Challenger Shanghai | 09/03 05:00 | 25 |
[191] Beibit Zhukayev
v
Ilia Simakin [236] |
4-6,7-6,5-7 | |
| Challenger Zhangjiagang | 08/29 08:00 | 27 |
[236] Ilia Simakin v
Sho Shimabukuro
[198]
|
4-6,3-6 | |
| Challenger Zhangjiagang | 08/28 08:00 | 26 | [236] Ilia Simakin v Joshua Charlton [217] | 6-4,6-4 | |
| Challenger Zhangjiagang | 08/26 11:55 | 25 |
[236] Ilia Simakin v
Tung-Lin Wu
[275]
|
6-4,7-6 | |
| ITF M25 Roda de Bara | 07/11 10:00 | - | [228] Ilia Simakin v Adria Soriano Barrera [384] | 2-6,6-3,3-6 | |
| ITF M25 Roda de Bara | 07/10 11:07 | - | Ilia Simakin v Iker Urribarrens Ramirez | 7-5,6-1 | |
| ITF M25 Roda de Bara | 07/08 15:45 | - | Ilia Simakin v William Grant | 7-5,6-4 | |
| ITF M25 Figueira da Foz | 07/02 12:42 | - | [228] Ilia Simakin v Alex Martinez [436] | 3-6,1-6 | |
| Challenger Chisinau | 06/01 11:00 | 29 |
[249] Ilia Simakin v
Clement Chidekh
[297]
|
6-7,5-7 | |
| Challenger Chisinau | 05/31 11:00 | 28 | [249] Ilia Simakin v Giles Hussey [434] | 7-5,6-3 | |
| Challenger Chisinau | 05/30 08:00 | 27 | [249] Ilia Simakin v Petr Bar Biryukov [340] | 6-3,4-6,6-2 | |
| Challenger Chisinau | 05/29 09:50 | 26 | [249] Ilia Simakin v Philip Henning [360] | 6-4,6-1 | |
| Challenger Chisinau | 05/28 07:00 | 25 | Ilia Simakin v Charlie Robertson | 7-5,7-6 | |
| Challenger Tbilisi | 05/21 10:35 | 26 |
[316] George Loffhagen
v
Ilia Simakin [247] |
6-4,7-5 |
Ilia Simakin (born 27 October 2003) is a Russian professional tennis player. He has a career-high ATP singles ranking of No. 228 achieved on 9 June 2025 and a best doubles ranking of No. 230 achieved on 19 May 2025.