Istanbul 5 challenger · ATP
Istanbul 5 challenger 2026
ChallengerHardIstanbul, Türkiye2 August – 9 August 2026Prize money: 63,000 USD49 matchesAltitude: 32 mCourt: Medium-fast
Champion Lucas Poullain · Final: 6-0 6-7(7) 6-4
Final rounds
| Final | Lucas Poullain vs Ilia Simakin | 5-7 6-2 6-3 |
| Semifinal | Lucas Poullain vs Gijs Brouwer | 6-1 6-0 |
| Semifinal | Ilia Simakin vs Antoine Ghibaudo | 7-6(5) 7-6(2) |
| Quarterfinal | Gijs Brouwer vs Koki Matsuda | 6-4 1-6 6-2 |
| Quarterfinal | Lucas Poullain vs Kenta (2004) Miyoshi | 6-7(3) 6-1 6-4 |
| Quarterfinal | Antoine Ghibaudo vs Max Basing | 6-2 0-0 ret. |
| Quarterfinal | Ilia Simakin vs Florent Bax | 6-0 6-7(7) 6-4 |
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