Isabelle Haverlag (born 4 March 2001) is a Dutch tennis player who specializes in doubles. She has a career-high doubles ranking of No. 65 by the WTA, achieved on 8 June 2026. She has won four WTA 125 doubles titles as well as 14 doubles titles on the ITF Women's World Tennis Tour.

Career She won her first big title at the 2022 Open de Seine-et-Marne, in the doubles draw, partnering Justina Mikulskytė.

In June 2022, she made her WTA Tour debut in doubles with compatriot Suzan Lamens at her home tournament, the Rosmalen Open, where as a wildcard pair they reached the quarterfinals defeating third seeds Kaitlyn Christian and Giuliana Olmos. In July 2024 at the Budapest Grand Prix, she reached the semifinals with Christina Rosca.

In February 2025 at the ATX Open, Haverlag and her partner Alicja Rosolska reached the semifinals defeating second seeded pair of former No. 1 doubles player Storm Hunter and former top 10 player Caroline Dolehide en route. Playing alongside Simona Waltert, she won her first WTA 125 doubles title at the 2025 Ilkley Open by defeating Vitalia Diatchenko and Eden Silva in the final.

Partnering Maia Lumsden, Haverlag reached her first WTA Tour final at the 2026 Mérida Open, losing to second seeds Cristina Bucșa and Jiang Xinyu. Once again teaming up with Lumsden, she won the second WTA 125 title at the 2026 Open de Saint-Malo, defeating Chan Hao-ching and Ivana Corley in the final.

Performance timeline

WTA Tour finals

Doubles: 1 (runner-up) LegendWTA 500 (1–0)WTA 250 (0–0)Finals by surfaceHard (1–0)

ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss 0–1 Mar 2026Mérida Open, MexicoWTA 500 Hard Maia Lumsden Cristina Bucșa Jiang Xinyu 4–6, 1–6

WTA 125 finals Doubles: 7 (4 titles, 3 runner-ups) ResultW–LDateTournamentSurfacePartnerOpponentsScoreWin 1–0 Jun 2025Ilkley Open, United Kingdom Grass Simona Waltert Vitalia Diatchenko Eden Silva 6–1, 6–1Loss 1–1 Contrexéville Open, France Clay Emily Appleton Quinn Gleason Ingrid Martins 1–6, 6–7(4–7)Loss 1–2 Polish Open, Poland Hard Martyna Kubka Weronika Falkowska Dominika Šalková 2–6, 1–6Loss 1–3 Mar 2026Austin Challenger, United States Hard Sabrina Santamaria Chan Hao-ching Miyu Kato 2–6, 3–6Win 2–3 Open de Saint-Malo, France Clay Maia Lumsden Chan Hao-ching Ivana Corley 6–4, 6–0Win 3–3 Makarska Open, Croatia Clay Simona Waltert Ingrid Martins Ekaterina Ovcharenko 2–2 ret.Win 4–3 Philly Open, United States Hard Nika Radišić Jesika Malečková Miriam Škoch 6–2, 1–6, [10–7]

ITF Circuit finals Doubles: 37 (14 titles, 23 runner-ups) LegendW100 tournamentsW60/75 tournamentsW40/50 tournamentsW25/35 tournamentsW15 tournaments ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreWin 1–0 Mar 2018ITF Amiens, FranceW15 Clay Julie Belgraver Lara Salden Camille Sireix 7–6(4), 6–2Loss 1–1 Aug 2018ITF Rotterdam, NetherlandsW15 Clay Dewi Dijkman Suzan Lamens Sviatlana Pirazhenka 3–6, 6–4, [5–10]Loss 1–2 Jul 2019ITF Cancún, MexicoW15 Hard Dewi Dijkman Thaisa Grana Pedretti María Portillo Ramírez 5–7, 3–6Loss 1–3 Oct 2019ITF Tabarka, TunisiaW15 Clay Anastasia Pribylova Giulia Crescenzi Aurora Zantedeschi 7–5, 6–7(4), [8–10]Win 2–3 Nov 2019ITF Solarino, ItalyW15 Carpet Anna Popescu Maria Masini Anastasia Piangerelli 6–1, 6–1Win 3–3 Mar 2021ITF Monastir, TunisiaW15 Hard Anastasia Pribylova Rina Saigo Yukina Saigo 6–3, 6–1Win 4–3 Mar 2021ITF Monastir, TunisiaW15 Hard Anastasia Pribylova Anastasia Kulikova Yasmine Mansouri 6–3, 6–1Win 5–3 Apr 2021ITF Monastir, TunisiaW15 Hard Anastasia Pribylova Alexandra Osborne Andrea Renée Villarreal 6–3, 6–1Loss 5–4 Apr 2021ITF Cairo, EgyptW15 Clay Merel Hoedt Elina Avanesyan Maria Timofeeva 6–1, 4–6, [8–10]Win 6–4 Feb 2022ITF Sharm El Sheikh, EgyptW25 Hard Justina Mikulskytė Irina Fetecău Simona Waltert 6–1, 6–2Loss 6–5 Feb 2022ITF Santo Domingo, Dominican Rep.W25 Hard Jasmijn Gimbrère Anna Rogers Christina Rosca 2–6, 2–6Win 7–5 Apr 2022Open de Seine-et-Marne, FranceW60 Hard (i) Justina Mikulskytė Sofya Lansere Oksana Selekhmeteva 6–4, 6–2Loss 7–6 Apr 2022ITF Nottingham, United KingdomW25 Hard Ioana Loredana Roșca Eudice Chong Cody Wong 2–6, 3–6Loss 7–7 May 2022ITF Platja d'Aro, SpainW25 Clay Valeriya Strakhova Ángela Fita Boluda Andrea Gámiz 4–6, 6–3, [3–10]Win 8–7 Jul 2022ITF Hague, NetherlandsW25 Clay Jasmijn Gimbrère Nikki Redelijk Bente Spee 6–2, 6–4Loss 8–8 Jul 2022Open Araba en Femenino, SpainW60 Hard Justina Mikulskytė Maria Bondarenko Ioana Loredana Roșca 6–4, 4–6, [9–11]Loss 8–9 Jul 2022ITF Nottingham, United Kingdom W25 Hard Jasmijn Gimbrère Lee Pei-chi Wu Fang-hsien 3–6, 2–6Loss 8–10 Oct 2022Monastir Open, TunisiaW60 Hard Suzan Lamens Priska Madelyn Nugroho Wei Sijia 3–6, 2–6Loss 8–11 Feb 2023GB Pro-Series Bath, UKW25 Hard (i) Emily Appleton Lauryn John-Baptiste Katarína Strešnaková 6–7(4), 4–6Win 9–11 May 2023ITF Bodrum, TurkeyW60 Clay Oana Gavrilă Ayla Aksu Harriet Dart 6–4, 7–6(3)Loss 9–12 Jul 2023ITF The Hague, NetherlandsW40 Clay Jasmijn Gimbrère Kristina Mladenovic Arantxa Rus 4–6, 0–6Loss 9–13 Aug 2023Internazionali di Cordenons, ItalyW60 Clay Eva Vedder Angelica Moratelli Camilla Rosatello 6–0, 2–6, [5–10]Loss 9–14 Aug 2023ITF Oldenzaal, NetherlandsW40 Clay Eva Vedder Gergana Topalova Daniela Vismane 5–7, 6–2, [5–10]Loss 9–15 Open Nantes Atlantique, FranceW60 Hard (i) Emily Appleton Ali Collins Lily Miyazaki 6–7(4), 2–6Loss 9–16 ITF Pétange, LuxembourgW40 Hard (i) Ali Collins Alicia Barnett Samantha Murray Sharan 7–6(4), 1–6, [6–10]Loss 9–17 Jan 2024ITF Naples, United StatesW35 Clay Lia Karatancheva Elvina Kalieva Maria Kozyreva 0–6, 0–6Loss 9–18 Feb 2024ITF Mâcon, FranceW50 Hard (i) Madeleine Brooks Silvia Ambrosio Lena Papadakis 7–5, 5–7, [7–10]Win 10–18 Mar 2024Trnava Indoor, SlovakiaW75 Hard (i) Anna Rogers Liang En-shuo Tang Qianhui 6–3, 4–6, [12–10]Win 11–18 Oct 2024Slovak Open, SlovakiaW75 Hard (i) Elena Pridankina Katarína Kužmová Nina Vargová 7–5, 6–2Loss 11–19 Oct 2024GB Pro-Series Glasgow, UKW75 Hard (i) Mariam Bolkvadze Jodie Burrage Freya Christie 4–6, 6–3, [5–10]Win 12–19 Oct 2024Hamburg Ladies Cup, GermanyW75 Hard (i) Madeleine Brooks Riya Bhatia Lian Tran 6–3, 6–2Loss 12–20 Nov 2024Ismaning Open, GermanyW75 Carpet (i) Carole Monnet Aneta Kučmová Aneta Laboutková 6–4, 4–6, [7–10]Win 13–20 Nov 2024Trnava Indoor, SlovakiaW75 Hard (i) Madeleine Brooks Anastasia Dețiuc Aneta Kučmová 7–6(5), 6–1Loss 13–21 Dec 2024Dubai Tennis Challenge, United Arab EmiratesW100 Hard Elena Pridankina Anastasia Dețiuc Anastasia Tikhonova 3–6, 7–6(7), [8–10]Loss 13–22 Feb 2025AK Ladies Open, GermanyW75 Carpet (i) Emily Appleton Marie Benoît Dalila Jakupović 5–7, 6–7(6)Win 14–22 Mar 2025Trnava Indoor, SlovakiaW75 Hard (i) Elena Pridankina Magali Kempen Jessika Ponchet 6–2, 6–3Loss 14–23 Jan 2026ITF Fujairah Championships, U.A.E.W100 Hard Elena Pridankina Harriet Dart Maia Lumsden 1–6, 0–6

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