| Challenger Bengaluru | 02/08 06:30 | 25 | Elias Ymer v Cem Ilkel | Cancelled | |
| ATP Pune | 02/01 12:35 | 25 | [193] Vit Kopriva v Cem Ilkel [183] | 6-4,6-2 | |
| Challenger Forli | 01/18 14:40 | 25 | [150] Cem Ilkel v Lukas Rosol [271] | 4-6,6-7 | |
| Australian Open | 01/10 23:00 | 14 | [166] Enzo Couacaud v Cem Ilkel [154] | 6-3,6-7,6-4 | |
| Challenger Bendigo | 01/04 04:55 | 25 | [198] Vit Kopriva v Cem Ilkel [144] | 7-6,6-3 | |
| Challenger Antalya | 12/10 07:00 | 27 | [144] Cem Ilkel v Oleg Prihodko [409] | 3-6,6-3,2-6 | |
| Challenger Antalya | 12/09 08:20 | 26 | [144] Cem Ilkel v Filip C Jianu [318] | 6-7,6-4,6-0 | |
| Challenger Antalya | 12/07 09:10 | 25 | Cem Ilkel v Ivan Nedelko | 6-4,7-5 | |
| Challenger Antalya | 12/01 07:00 | 26 | [144] Cem Ilkel v Javier Barranco Cosano [305] | 6-7,3-6 | |
| Challenger Antalya | 11/29 10:45 | 25 | [144] Cem Ilkel v Yu Hsiou Hsu [358] | 6-3,6-4 | |
| Challenger Manama | 11/24 10:50 | 26 | [262] Nuno Borges v Cem Ilkel [145] | 6-3,6-1 | |
| Challenger Manama | 11/22 15:00 | 25 | [308] Ergi Kirkin v Cem Ilkel [145] | 4-6,2-6 | |
| Challenger Bratislava | 11/11 11:40 | 26 | [81] Stefano Travaglia v Cem Ilkel [145] | 6-4,6-2 | |
| Challenger Bratislava | 11/10 09:30 | 25 | [145] Cem Ilkel v Alexander Shevchenko [352] | 6-4,6-7,6-3 | |
| Challenger Bergamo | 11/07 15:30 | 29 | [118] Holger Vitus Nodskov Rune v Cem Ilkel [158] | 7-5,7-6 | |
| Challenger Bergamo | 11/06 20:00 | 28 | [158] Cem Ilkel v Fabian Marozsan [415] | 7-6,5-7,6-4 | |
| Challenger Bergamo | 11/05 14:00 | 27 | [121] Liam Broady v Cem Ilkel [158] | 5-7,6-3,1-6 | |
| Challenger Bergamo | 11/04 11:50 | 26 | [158] Cem Ilkel v Radu Albot [127] | 7-5,6-3 | |
| Challenger Bergamo | 11/02 10:30 | 25 | [272] Pavel Kotov v Cem Ilkel [158] | 6-4,1-6,6-7 | |
| Challenger Ismaning | 10/26 11:20 | 25 | [160] Cem Ilkel v Julian Lenz [314] | 7-6,5-7,1-6 | |
| ATP Indian Wells | 10/08 21:20 | 23 | [179] Cem Ilkel v Jenson Brooksby [79] | 6-7,4-6 | |
| ATP Indian Wells | 10/06 20:10 | 19 | Govind Nanda v Cem Ilkel | 1-6,6-2,4-6 | |
| ATP Indian Wells | 10/05 19:50 | 14 | [230] Maxime Janvier v Cem Ilkel [179] | 2-6,7-6,6-7 | |
| ATP Sofia | 09/26 09:00 | 14 | [87] Andreas Seppi v Cem Ilkel [180] | 7-6,6-2 | |
| Challenger Biel | 09/22 12:45 | 26 | [180] Cem Ilkel v Tobias Kamke [257] | 4-6,6-7 | |
| Challenger Biel | 09/21 11:25 | 25 | [180] Cem Ilkel v Matteo Viola [292] | 7-6,7-6 | |
| Davis Cup | 09/18 10:35 | - | Cem Ilkel v Ernests Gulbis | 6-4,6-1 | |
| US Open | 08/30 20:35 | 23 | [138] Alex Molcan v Cem Ilkel [188] | 4-6,6-3,6-1,6-1 | |
| US Open | 08/27 15:00 | 19 | [189] Cem Ilkel v Jiri Lehecka [192] | 7-6,6-3 | |
| US Open | 08/26 15:00 | 15 | [132] Fernando Verdasco v Cem Ilkel [189] | 6-4,3-6,4-6 |
Cem Ilkel (born 21 August 1995) is a Turkish tennis player.
İlkel has a career high ATP singles ranking of No. 144 achieved on 29 November 2021. He also has a career high ATP doubles ranking of No. 299 achieved on 27 August 2018. He has won one ATP Challenger title in singles. He is currently the No. 1 Turkish player. Ilkel has a singles final record of 5 wins and 20 losses, and a doubles final record of 13 wins and 11 losses.