The 2025 QNB Istanbul Challenger 77. TED Open was a professional tennis tournament played on hardcourts. It was the 39th edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Istanbul, Turkey between 1 and 7 September 2025.
Singles main-draw entrants Seeds Country Player Rank1 SeedLukáš Klein1191Otto Virtanen1232Martín Landaluce1383Harold Mayot1524Moez Echargui1655Calvin Hemery1856Hugo Grenier1887Benjamin Hassan2008Rodrigo Pacheco Méndez2249 1 Rankings are as of 25 August 2025.
Other entrants The following players received wildcards into the singles main draw: Kaya Arınç Koray Kırcı Mert Naci Türker
The following player received entry into the singles main draw using a protected ranking: Ilya Ivashka
The following players received entry into the singles main draw as alternates: Alastair Gray Miloš Karol Alex Molčan Mats Rosenkranz
The following players received entry from the qualifying draw: Alex Hernández Michal Krajčí Péter Makk Ivan Nedelko Luca Potenza Vadym Ursu
Champions Singles
Alex Molčan def. Nicolás Mejía 7–6(11–9), 6–2.
Doubles
Miloš Karol / Daniel Masur def. Stefanos Sakellaridis / Karan Singh 7–6(7–2), 6–1.
References