Stadium: Court 7 Round: 27
| ITF Women Lisbon | 2018/09/20 13:30 | Arn, Greta v Yvonne Cavalle-Reimers | 6-3,4-6,6-3 |
| ITF Women Lisbon | 2018/09/19 14:05 | Arn, Greta v Mirjam Bjorklund | 6-2,2-6,6-0 |
| ITF Women Braunschweig | 2018/08/25 14:45 | Jule Niemeier v Arn, Greta | 0-6,6-0,7-6 |
| ITF Women Braunschweig | 2018/08/24 12:50 | Saez Larra, Olga v Arn, Greta | 3-6,4-6 |
| ITF Women Braunschweig | 2018/08/23 14:00 | Alexandra Vecic v Arn, Greta | 6-7,0-6 |
| ITF Women Braunschweig | 2018/08/21 12:35 | Arn, Greta v Burger, Cindy | 7-5,6-3 |
| WTA Gstaad Qual | 2018/07/14 15:50 | Arn, Greta v Allie Kiick | 2-6,2-6 |
| ITF Women Budapest | 2018/07/09 11:00 | Tena Lukas v Arn, Greta | 6-2,6-4 |
| ITF Women Lisbon | 2018/09/20 11:00 | Nuria Parrizas-Diaz v Tereza Martincova | 6-3,6-7,6-3 |
| ITF Women Lisbon | 2018/09/19 09:00 | Barnett, Alicia v Nuria Parrizas-Diaz | 6-7,6-4,2-6 |
| Sofia, Singles W-WITF-BUL-01A | 2018/09/06 07:00 | Basak Eraydin v Nuria Parrizas-Diaz | 7-5,7-6 |
| Sofia, Singles W-WITF-BUL-01A | 2018/09/04 08:00 | Nuria Parrizas-Diaz v Lynelle En Tong Lim | 6-0,6-0 |
| ITF Women Bagnatica | 2018/08/27 11:05 | Nuria Parrizas-Diaz v Lucia Bronzetti | 2-6,7-6,4-6 |
| ITF Women Bagnatica | 2018/08/26 13:10 | Nuria Parrizas-Diaz v Hofer, Verena | 6-2,4-6,7-5 |
| El Espinar, Singles W-WITF-ESP-14A | 2018/08/01 09:00 | Nuria Parrizas-Diaz v Samsonova, Liudmila | 2-6,4-6 |
| El Espinar, Singles W-WITF-ESP-14A | 2018/07/30 09:00 | Nuria Parrizas-Diaz v Carrillo Marin, Alba | 6-2,6-2 |