| Challenger Bratislava | 11/10 13:15 | 26 | [446] Illya Marchenko v Cem Ilkel [407] | 6-4,5-7,3-6 | |
| Challenger Bratislava | 11/08 09:00 | 25 | [407] Cem Ilkel v Zizou Bergs [138] | 6-7,6-4,6-1 | |
| Challenger Bratislava | 11/07 10:50 | 19 | [286] Vitaliy Sachko v Cem Ilkel [407] | 3-6,6-3,3-6 | |
| Challenger Bratislava | 11/06 13:10 | 14 | [447] Denis Istomin v Cem Ilkel [318] | 6-7,5-7 | |
| Challenger Bergamo | 11/01 09:00 | 25 | [318] Cem Ilkel v Dennis Novak [170] | 2-6,4-6 | |
| Challenger Bergamo | 10/31 09:00 | 19 | [318] Cem Ilkel v Illya Marchenko [436] | 7-6,6-2 | |
| Challenger Bergamo | 10/30 11:15 | 14 | [166] Alexander Ritschard v Cem Ilkel [316] | 1-6,3-6 | |
| Challenger Vilnius | 10/23 10:00 | 29 | [186] Mattia Bellucci v Cem Ilkel [416] | 1-6,6-3,7-5 | |
| Challenger Vilnius | 10/22 08:00 | 28 | [416] Cem Ilkel v Dan Added [325] | 7-6,6-4 | |
| Challenger Vilnius | 10/21 09:00 | 27 | [204] Laurent Lokoli v Cem Ilkel [416] | 5-7,3-6 | |
| Challenger Vilnius | 10/20 11:45 | 26 | [275] Mate Valkusz v Cem Ilkel [416] | 6-7,7-6,1-6 | |
| Challenger Vilnius | 10/19 09:55 | 25 | [416] Cem Ilkel v Matteo Arnaldi [141] | 6-3,6-2 | |
| Challenger Vilnius | 10/17 09:05 | 19 | [416] Cem Ilkel v Luca Potenza [437] | 6-4,6-0 | |
| Challenger Vilnius | 10/16 13:50 | 14 | Cem Ilkel v Tomas Vaise | 6-2,6-1 | |
| ATP Nur-Sultan | 10/01 09:50 | 14 | [382] Cem Ilkel v Zhizhen Zhang [123] | 7-6,2-6,1-6 | |
| ATP Tel Aviv | 09/27 13:40 | 25 | [382] Cem Ilkel v Sebastian Korda [44] | 4-6,4-6 | |
| ATP Tel Aviv | 09/26 10:55 | 19 | [148] Alexander Shevchenko v Cem Ilkel [382] | 6-2,4-6,1-6 | |
| ATP Tel Aviv | 09/25 08:40 | 14 | [367] Cem Ilkel v Zsombor Piros [160] | 4-6,7-6,7-6 | |
| Davis Cup | 09/18 18:40 | 5 | Nicolas Mejia v Cem Ilkel | Cancelled | |
| Davis Cup | 09/17 17:20 | 2 | [75] Daniel Elahi Galan v Cem Ilkel [365] | 6-2,6-2 | |
| Challenger Prague | 08/23 11:30 | 25 | [384] Lucas Gerch v Cem Ilkel [303] | 6-4,6-2 | |
| Wimbledon | 06/20 10:00 | 14 | [98] Jason Kubler v Cem Ilkel [237] | 3-6,7-5,6-2 | |
| ATP Stuttgart | 06/04 15:05 | 14 | [94] Peter Gojowczyk v Cem Ilkel [213] | 6-3,6-1 | |
| French Open | 05/16 08:00 | 14 | [216] Alexandre Muller v Cem Ilkel [213] | 6-0,6-1 | |
| Challenger Biel | 03/22 09:00 | 25 | Cem Ilkel v Daniel Masur | Cancelled | |
| Davis Cup | 03/05 11:10 | 45 | Sergey Fomin v Cem Ilkel | 6-7,6-7 | |
| Davis Cup | 03/04 08:00 | 45 | Sanjar Fayziev v Cem Ilkel | 6-3,6-7,6-4 | |
| Challenger Bengaluru | 02/11 07:45 | 27 | [186] Cem Ilkel v Alexandre Muller [208] | 4-6,6-7 | |
| Challenger Bengaluru | 02/10 05:30 | 26 | [186] Cem Ilkel v Evgeny Donskoy [195] | 2-6,6-3,7-5 | |
| Challenger Bengaluru | 02/08 06:35 | 25 | [264] Steven Diez v Cem Ilkel [186] | 2-6,3-6 |
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.