Stadium: Court 13 Round: 25 Ground: Hardcourt outdoor
| Mildura, Simples W-ITF-AUS-06A | 2019/03/08 02:20 | Lulu Sun v Gerlach, Katharina | 6-2,6-0 |
| Mildura, Simples W-ITF-AUS-06A | 2019/03/06 23:00 | Alana Parnaby v Gerlach, Katharina | 2-6,6-7 |
| Mildura, Simples W-ITF-AUS-06A | 2019/03/05 02:40 | Gerlach, Katharina v Hiroko Kuwata | 6-3,3-6,6-3 |
| ITF W25 Altenkirchen | 2019/02/18 18:45 | Gerlach, Katharina v Stephanie Wagner | 6-3,3-6,5-10 |
| ITF W25 Altenkirchen | 2019/02/18 13:55 | Gerlach, Katharina v Emily Webley-Smith | 6-2,6-4 |
| Shrewsbury, Simples W-ITF-GBR-02A | 2019/02/11 10:00 | Zimmermann, Kimberley v Gerlach, Katharina | 6-3,6-3 |
| Midland, Simples W-ITF-USA-03A | 2019/01/28 15:00 | Gleason, Quinn v Gerlach, Katharina | 2-6,6-2,10-7 |
| Newport Beach, USA | 2019/01/21 20:20 | Harmony Tan v Gerlach, Katharina | 6-4,6-2 |
| Mildura, Simples W-ITF-AUS-06A | 2019/03/06 02:00 | Olivia Tjandramulia v Perez, Ellen | 4-6,2-6 |
| Osaka, Singles W-ITF-JPN-02A | 2019/02/25 02:30 | Ozaki, Risa v Olivia Tjandramulia | 4-6,7-6,10-5 |
| ITF W60 Kyoto | 2019/02/18 03:30 | Akiko Omae v Olivia Tjandramulia | 6-1,6-0 |
| Singapour, Simples W-ITF-SGP-04A | 2019/01/24 02:00 | Olivia Tjandramulia v Haas, Barbara | 2-6,2-6 |
| Singapour, Simples W-ITF-SGP-04A | 2019/01/23 02:00 | Steur, Julyette Maria Josephine v Olivia Tjandramulia | 0-6,1-6 |
| Singapour, Simples W-ITF-SGP-04A | 2019/01/22 02:00 | Victoria Rodriguez v Olivia Tjandramulia | 6-1,5-7,7-10 |
| Singapour, Simples W-ITF-SGP-04A | 2019/01/17 02:00 | Olivia Tjandramulia v Haas, Barbara | 4-6,1-6 |
| Singapour, Simples W-ITF-SGP-04A | 2019/01/16 02:00 | Victoria Rodriguez v Olivia Tjandramulia | 3-6,2-6 |