Istanbul 2 challenger · ATP
Istanbul 2 challenger 2021
ChallengerHardIstanbul, Türkiye12 September – 19 September 2021Prize money: 52,080 USD43 matchesAltitude: 32 mCourt: Slow
Champion James Duckworth · Final: 7-5 6-2
Final rounds
| Final | James Duckworth vs Tung-lin Wu | 6-4 6-2 |
| Semifinal | Tung-lin Wu vs Borna Gojo | 6-4 3-6 6-4 |
| Semifinal | James Duckworth vs Quentin Halys | 6-7(9) 6-3 6-4 |
| Quarterfinal | Borna Gojo vs Geoffrey Blancaneaux | 7-6(6) 6-4 |
| Quarterfinal | Tung-lin Wu vs Aldin Setkic | 6-3 6-2 |
| Quarterfinal | James Duckworth vs Hugo Grenier | 6-3 6-3 |
| Quarterfinal | Quentin Halys vs Yasutaka Uchiyama | 7-5 6-2 |
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