| ITF W25 Bragado | 07/26 14:25 | 25 | [445] Guillermina Naya v Fernanda Labrana [472] | 3-6,6-3,6-1 | |
| ITF W15 Rosario | 07/02 16:00 | 29 | Sol A Larraya Guidi v Guillermina Naya | 2-6,0-6 | |
| ITF W15 Rosario | 07/01 13:50 | 28 | Maria F Urrutia v Guillermina Naya | 2-6,6-7 | |
| ITF W15 Rosario | 06/30 13:00 | 27 | Luciana Blatter v Guillermina Naya | 3-6,3-6 | |
| ITF W15 Rosario | 06/29 13:00 | 26 | Maria Victoria Burstein v Guillermina Naya | 2-6,2-6 | |
| ITF W15 Rosario | 06/28 16:20 | 25 | Sol Rabin v Guillermina Naya | 0-6,1-6 | |
| ITF W15 Buenos Aires | 06/24 13:00 | 28 | Guillermina Naya v Mell E R Gonzalez | 2-6,0-6 | |
| ITF W15 Buenos Aires | 06/23 14:00 | 27 | [456] Guillermina Naya v Fernanda Labrana [450] | 6-1,6-3 | |
| ITF W15 Buenos Aires | 06/22 15:25 | 26 | Guillermina Naya v Serena P Giubbani | 7-5,7-5 | |
| ITF W15 Buenos Aires | 06/21 12:55 | 25 | Chiara Di Genova v Guillermina Naya | 2-6,7-6,5-7 | |
| ITF W60 Rome | 06/16 13:55 | 27 | [496] Guillermina Naya v Silvia Ambrosio [382] | 2-6,1-6 | |
| ITF W60 Rome | 06/16 09:25 | 26 | [181] Chloe Paquet v Guillermina Naya [496] | 2-6,6-7 | |
| ITF W60 Rome | 06/15 08:30 | 25 | Denise Valente v Guillermina Naya | 1-6,1-6 | |
| ITF W60 Rome | 06/13 13:45 | 54 | [496] Guillermina Naya v Ana Candiotto [478] | 6-2,7-6 | |
| ITF W60 Rome | 06/12 12:40 | 54 | [495] Lisa Pigato v Guillermina Naya [496] | 5-7,6-7 | |
| WTA La Bisbal D'Emporda | 06/05 13:20 | 19 | [211] Timea Babos v Guillermina Naya [496] | 6-2,4-6,6-2 | |
| ITF W25 Guayaquil | 04/27 17:25 | 26 | Seone Mendez v Guillermina Naya | 6-3,6-2 | |
| ITF W25 Guayaquil | 04/26 18:00 | 25 | Guillermina Naya v Ana Sofia Sanchez | 6-2,7-5 | |
| ITF W25 Guayaquil | 04/25 15:40 | 24 | Anastasia Iamachkine v Guillermina Naya | 4-6,2-6 | |
| ITF W25 Guayaquil | 04/19 18:35 | 25 | Daniela Vismane v Guillermina Naya | 6-1,3-6,7-6 | |
| ITF W25 Guayaquil | 04/18 14:00 | 24 | Lucciana Perez Alarcon v Guillermina Naya | 2-6,6-7 | |
| ITF W25 Sopo | 03/28 16:05 | 54 | Berta Bonardi v Guillermina Naya | 6-2,6-1 | |
| ITF W25 Sopo | 03/27 15:50 | 54 | Guillermina Naya v Ana G Requena | 6-3,6-3 | |
| ITF W25 Mosquera | 03/22 14:30 | 25 | Guillermina Naya v Carolina Alves | 2-6,3-6 | |
| ITF W25 Mosquera | 03/21 17:10 | 54 | Guillermina Naya v Romina Ccuno | 7-5,6-2 | |
| ITF W25 Mosquera | 03/20 18:30 | 54 | Dalayna Hewitt v Guillermina Naya | 2-6,4-6 | |
| UTR Pro Tigre Women | 03/16 11:30 | - | Guillermina Naya v Susan Doldan | 6-3,6-0 | |
| UTR Pro Tigre Women | 03/15 18:05 | - | Guillermina Naya v Luciene Benitez Boiero | 6-2,6-2 | |
| UTR Pro Tigre Women | 03/14 12:00 | - | Guillermina Naya v Ani Vangelova | 6-2,5-2 | |
| UTR Pro Tigre Women | 03/13 13:30 | - | Guillermina Naya v Martina M Bovio | 6-2,6-2 |