Alex Knaff (born 26 November 1997) is a Luxembourgish tennis player. He has a career high ATP singles ranking of No. 486 achieved on 11 September 2023 and a career high ATP doubles ranking of No. 364 achieved on 11 September 2023.
Tennis career Knaff played college tennis at Florida State University.
Knaff won his first ITF title in his college town in 2022. He represented Luxembourg at the Davis Cup since 2015, where he has a W/L record of 12–10.
Future and Challenger finals
Singles 4 (3-3) Legend (singles)ITF Futures Tour (3-3)Titles by surfaceHard (2–3)Clay (1–0)Grass (0–0)Carpet (0–0) ResultW–LDateTournamentTierSurfaceOpponentScoreLoss0–1 Mexico M15, CancunWorld Tennis TourHard Brandon Holt1–6, 2–6Win1–1 USA M15, TallahasseeWorld Tennis TourHard William Grant6–3, 6–0Win2–1 Luxembourg M25, Esch-sur-AlzetteWorld Tennis TourClay Marlon Vankan6–3, 6–1Loss2–2 Egypt M15, Sharm El SheikhWorld Tennis TourHard Mohamed Safwat4–6, 4–6Win3–2 Thailand M15, NonthaburiWorld Tennis TourHard Petr Bar Biryukov6-1, 7-6(7–3)Loss3-3 Thailand M15, NonthaburiWorld Tennis TourHard Etienne Donnet4–6, 2–6
Doubles 14 (7–7) Legend (doubles)ITF Futures Tour (7–6)Titles by surfaceHard (2–5)Clay (4–1)Grass (0–0)Carpet (0–0) ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1 United States M15, IthacaWorld Tennis TourHard Joshua Peck Vasil Kirkov Luke Johnson6–7(3–7), 3–6Loss0–2 Tunisia M15, MonastirWorld Tennis TourHard Aziz Dougaz Hanwen Li Mateo Nicolas Martinez1–6, 6–2, 8–10Win1–2 Tunisia M15, MonastirWorld Tennis TourHard Aziz Dougaz Tomohiro Masabayashi Ren Nakamura6–2, 6–4Loss1-3 United States M15, SunriseWorld Tennis TourClay Alec Deckers Alexander Cozbinov Ruan Roelofse4–6, 4–6Win2-3 Belgium M15, DuffelWorld Tennis TourClay Chris Rodesch Franco Emanuel Egea Marcelo Zormann6–1, 6–4Win3-3 Luxembourg M25, Esch-sur-AlzetteWorld Tennis TourClay Chris Rodesch Raphael Calzi Marlon Vankan6–1, 6–4Win4-3 Manacor M25, ManacorWorld Tennis TourHard Filip Bergevi Alberto Barroso Campos Imanol López Morillo3–6, 6–3, 16–14Loss4-4 Sharm El Sheikh M15, Sharm El SheikhWorld Tennis TourHard Jakob Schnaitter Lukáš Pokorný Saba Purtseladze3–4, 4–6Loss4-5 Sharm El Sheikh M15, Sharm El SheikhWorld Tennis TourHard Jakob Schnaitter Alec Beckley Petr Nesterov6-3, 3–6, 8–10Win5-5 Pazardzhik M15, PazardzhikWorld Tennis TourClay Corentin Denolly Riccardo Balzerani Artsiom Sinitsyn6-0, 6–0Win6-5 Luxembourg M25, Esch-sur-AlzetteWorld Tennis TourClay Chris Rodesch Dimitris Sakellaridis Stefanos Sakellaridis6-3, 6–4Win7-5 Luxembourg M25, Esch-sur-AlzetteWorld Tennis TourClay David Pichler Dimitris Sakellaridis Stefanos Sakellaridis1-6, 6–1, 12–10Loss7-6 Villena M15, VillenaWorld Tennis TourHard Adrià Soriano Barrera Liam Gavrielides Alejo Sanchez Quilez2-6, 4–6Loss7-7 Torello M15, TorelloWorld Tennis TourHard Niklas Schell James Davis Giles Hussey1-6, 2–6
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