| ITF W80 Le Neubourg | 09/10 09:05 | 54 | [462] Manon Leonard v Haverlag, Isabelle [181] | 7-6,6-4 | |
| ITF W100 Figueira Da Foz | 07/23 11:25 | 54 | [185] Haverlag, Isabelle v Ksenia Zaytseva [463] | 2-6,1-6 | |
| ITF W60 Bodrum | 05/15 09:05 | 54 | Haverlag, Isabelle v Ayla Aksu | 2-6,3-6 | |
| ITF W60 Zagreb | 05/07 13:00 | 54 | [338] Naiktha Bains v Haverlag, Isabelle [183] | 3-6,6-0,6-3 | |
| ITF W80 Madrid | 11/14 09:00 | 54 | [165] Haverlag, Isabelle v Andreea Prisacariu [407] | 0-6,1-6 | |
| ITF W60 Monastir | 10/10 09:00 | 54 | [377] Oana Gavrila v Haverlag, Isabelle [179] | 6-1,6-1 | |
| ITF W60 Caldas da Rainha | 09/11 15:20 | 54 | [457] Maria Jose Portillo Ramirez v Haverlag, Isabelle [175] | 6-3,6-4 | |
| ITF W25 Oldenzaal | 08/23 09:35 | 19 | Lavinia Tanasie v Haverlag, Isabelle | 6-2,5-7,10-8 | |
| ITF W25 Oldenzaal | 08/22 08:00 | 54 | Rikke De Koning v Haverlag, Isabelle | 7-5,2-6,5-10 | |
| ITF W60 Vitoria-Gasteiz | 07/17 16:30 | 54 | Haverlag, Isabelle v Flavie Brugnone | 3-6,7-6,8-10 | |
| ITF W60 Amstelveen | 07/04 13:15 | 54 | [210] Haverlag, Isabelle v Michaela Bayerlova [496] | 2-6,4-6 | |
| ITF W25 Den Haag | 06/27 19:20 | 54 | Demi Tran v Haverlag, Isabelle | 7-6,6-0 | |
| ITF W25 Den Haag | 06/26 08:00 | 54 | Sanne Schalekamp v Haverlag, Isabelle | 1-6,3-6 | |
| ITF W60 Madrid | 06/13 09:05 | 54 | Lia Karatancheva v Haverlag, Isabelle | 6-1,6-2 | |
| ITF W60 Madrid | 06/12 10:25 | 54 | Alejandra R Botella v Haverlag, Isabelle | 0-6,1-6 | |
| ITF W25 Platja D’Aro | 05/17 08:00 | 62 | Lia Karatancheva v Haverlag, Isabelle | 6-4,6-0 | |
| ITF - W100 Wiesbaden | 05/02 09:55 | 54 | [304] Dalila Jakupovic v Haverlag, Isabelle [224] | 6-3,6-4 | |
| ITF W25 Nottingham Qual | 04/17 10:30 | 54 | Haverlag, Isabelle v Karola Patricia Bejenaru | 4-6,5-7 | |
| ITF W25 Nottingham | 04/10 12:20 | 54 | Hina Inoue v Haverlag, Isabelle | 6-4,6-4 | |
| ITF W25 Santo Domingo Qual | 02/28 17:05 | 54 | Lia Karatancheva v Haverlag, Isabelle | 6-0,6-2 | |
| ITF W25 Santo Domingo Qual | 02/27 17:00 | 54 | Sandor-Zur, Erika v Haverlag, Isabelle | 0-6,0-6 | |
| ITF W25 Santo Domingo | 02/21 16:25 | 54 | Hina Inoue v Haverlag, Isabelle | 6-1,6-0 | |
| ITF W25 Sharm El Sheikh | 01/31 11:45 | 44 | [258] Rutuja Bhosale v Haverlag, Isabelle [321] | 6-3,7-6 | |
| ITF W25 Selva Gardena | 11/28 17:45 | 54 | Haverlag, Isabelle v Anna Gabric | 3-6,4-6 | |
| ITF W60 Prague | 08/29 13:00 | 62 | Haverlag, Isabelle v Gergana Topalova | 3-6,5-7 | |
| ITF W25 Oldenzaal | 08/16 13:45 | 54 | [417] Aurora Zantedeschi v Haverlag, Isabelle [380] | 4-6,6-3,10-5 | |
| ITF W60 Olomouc | 07/18 08:00 | 62 | Haverlag, Isabelle v Ingrid Vojcinakova | 3-6,3-6 | |
| ITF W60 Amstelveen | 07/05 13:20 | 54 | [319] Caregaro, Martina v Haverlag, Isabelle [500] | 6-2,6-1 | |
| ITF W25 The Hague | 06/27 08:00 | 54 | Rosca, Ioana Loredana v Haverlag, Isabelle | 6-4,7-6 | |
| ITF W25 Porto | 06/20 15:00 | 62 | Ashlyn Krueger v Haverlag, Isabelle | 6-2,6-1 |