Isabelle Haverlag
Isabelle Haverlag is a Dutch tennis player who specializes in doubles. She has a career-high doubles ranking of world No. 96, by the WTA, achieved on 14 April 2025. She has won 13 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 2022 Libéma Open, where as a wildcard pair they reached the quarterfinals defeating third seeds Kaitlyn Christian and Giuliana Olmos.
In July 2024 at the 2024 Budapest Grand Prix she reached the semifinals with Christina Rosca. In February 2025 at the 2025 ATX Open Haverlag and her Polish 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.
Performance timeline
WTA Challenger finals
Doubles: 2 (1 titles, 1 runner-up)
ITF Circuit finals
Doubles: 36 (14 titles, 22 runner–ups)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Mar 2018 | ITF Amiens, France | W15 | Clay |  |