Vasil Kirkov (born March 13, 1999) is a Bulgarian-born American professional tennis player who specializes in doubles. He has a career high ATP doubles ranking of world No. 49 achieved on 10 August 2026. He has reached three ATP doubles finals. Kirkov has won 11 doubles ATP Challenger Tour titles, including 7 titles in 2025, tied for the second-most titles for that season. He also has a career high singles ranking of No. 439 achieved in November 2021.
Career Kirkov was awarded a qualifying wildcard at the 2016 US Open having reached the final of the USTA National Boy's 18 Championships in Kalamazoo, Michigan.
Kirkov made his Grand Slam doubles main draw debut at the 2017 US Open with Danny Thomas after receiving a wildcard for winning the USTA Boy's 18 National hardcourt Championships in Kalamazoo with Thomas.
In December 2019, Kirkov won the M15 in Cancun, Mexico, his first-ever ITF World Tennis Tour title as the No. 4 seed defeating No. 3 seed Nick Chappell in a close match with a scoreline of 6–7(3), 7–6(8), 7–6(1).
Kirkov won his first Challenger title at the 2023 Challenger Santa Fe partnering Chilean Matias Soto, and his second title at the 2023 Salinas Challenger partnering Alfredo Perez, after defeating Ángel Díaz Jalil and Álvaro Guillén Meza in the final. He reached the third round at the 2023 US Open after receiving a wildcard partnering Denis Kudla but lost to Ivan Dodig and Austin Krajicek.
He entered the ATP 500 2024 Mubadala Citi DC Open in Washington as a lucky loser partnering Evan King but they lost to Lloyd Glasspool and Santiago Gonzalez in the first round. He also received a wildcard in doubles for the 2024 US Open partnering Christian Harrison.
In March 2025, in Latin America, Kirkov won three back-to-back Challenger doubles titles in Santiago, Asunción, Paraguay and in Concepción, Chile partnering again with Chilean Matias Soto. Following two challenger finals in Asia, Kirkov reached the top 100 in the doubles rankings on 5 May 2025 at world No. 98. He won his eight title at the Challenger 100, the 2025 Wuxi Open, with Bart Stevens.
ATP Tour finals Doubles: 3 (3 runner-ups) LegendGrand Slam tournaments (0–0)ATP Masters 1000 (0–0)ATP 500 (0–0)ATP 250 (0–3)Finals by surfaceHard (0–2)Clay (0–1)Grass (0–0)
ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1Chengdu Open,China250 SeriesHard Bart Stevens Constantin Frantzen Robin Haase6–4, 3–6, [7–10]Loss0–2Stockholm Open,Sweden250 SeriesHard (i) Bart Stevens Alexander Erler Robert Galloway3–6, 2–6Loss0–3Grand Prix Hassan II,Morocco250 SeriesClay Bart Stevens Robert Cash JJ Tracy2–6, 3–6
Junior Grand Slam finals
Doubles: 1 (1 final) ResultYearTournamentSurfacePartnerOpponentsScoreLoss2017French OpenClay Danny Thomas Nicola Kuhn Zsombor Piros4–6, 4–6
ATP Challenger and ITF Tour finals
Doubles: 30 (19 titles, 11 runner-ups) LegendATP Challenger (11–11)ITF Futures (8–0) ATP Challenger Finals (11–11)
Finals by surfaceHard (4–8)Clay (7–3)
ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreWin1–0Santa Fe, ArgentinaChallengerClay Matías Soto Ignacio Carou Ignacio Monzón7–6(7–3), 6–2Win2–0Salinas, EcuadorChallengerClay Alfredo Perez Ángel Díaz Jalil Álvaro Guillén Meza7–5, 7–5Loss2–1Lexington, USChallengerHard George Goldhoff Eliot Spizzirri Tyler Zink6–4, 3–6, [8–10]Loss 2–2Fairfield, USChallengerHard Denis Kudla Evan King Reese Stalder5–7, 3–6Win3–2Tenerife, SpainChallengerHard Luis David Martínez Karol Drzewiecki Piotr Matuszewski3–6, 6–4, [10–3]Loss3–3Manama, BahrainChallenger Hard Patrik Niklas-Salminen Petros Tsitsipas Sergio Martos Gornes6–3, 3–6, [8–10]Loss 3–4 Seoul, KoreaChallenger Hard Bart Stevens Saketh Myneni Ramkumar Ramanathan 4–6, 6–4, [3–10]Win 4–4 Kobe, JapanChallenger Hard (i) Bart Stevens Kaichi Uchida Takeru Yuzuki 7–6(9–7), 7–5Loss4–5 Glasgow, United Kingdom ChallengerHard Marcus Willis Daniel Cukierman Joshua Paris7–5, 4–6, [10–12]Win5–5Santiago, ChileChallengerClay Matías Soto Mateus Alves Luís Britto6–4, 6–3Win6–5Asunción, ParaguayChallengerClay Matías Soto Mariano Kestelboim Guillermo Durán6–3, 6–4Win7–5 Concepción, ChileChallengerClay Matías Soto Takeru Yuzuki Seita Watanabe6–2, 6–4Loss7–6Gwangju, South KoreaChallengerHard Bart Stevens Ray Ho Matthew Romios3–6, 6–7(6–8)Loss7–7Guangzhou, ChinaChallengerHard Bart Stevens Ray Ho Matthew Romios3–6, 4–6Win8–7Wuxi, ChinaChallengerHard Bart Stevens Ray Ho Matthew Romios3–6, 7–5, [10–6]Win 9–7Bad Rappenau, GermanyChallenger Clay Bart Stevens Jakob Schnaitter Mark Wallner 7–6(7–5), 4–6, [10–7]Loss9–8Perugia, ItalyChallengerClay Robin Haase Romain Arneodo Manuel Guinard 6–3, 3–6, [5–10] Win10–8Braunschweig, GermanyChallengerClay Bart Stevens Alexander Merino Christoph Negritu6–2, 6–3Loss10–9Hagen, GermanyChallengerClay Bart Stevens Hendrik Jebens Albano Olivetti4–6, 7–6 (7–2), [8–10]Win11–9Roanne, FranceChallengerHard (i) Bart Stevens Joran Vliegen Jackson Withrow4–6, 6–1, [10–4]Loss11–10Manama, BahrainChallengerHard Bart Stevens Sriram Balaji Neil Oberleitner6–7 (1–7), 4–6 Loss11–11Aix-en-Provence, FranceChallengerClay Bart Stevens Robert Cash JJ Tracy7–5, 4–6 [4–10]
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