| ITF W80 Charlottesville | 04/24 14:00 | 25 | Emily Fanning v Lorraine M. Guillermo | 1-6,7-5,7-6 | |
| ITF W25 Pelham | 04/09 21:30 | 54 | Michaela Honcova v Lorraine M. Guillermo | 7-6,6-3 | |
| ITF W25 Pelham | 04/08 20:00 | 54 | Lorraine M. Guillermo v Ksenia Laskutova | 6-2,6-0 | |
| ITF W25 Jackson | 04/02 18:45 | 25 | Zuzana Zlochova v Lorraine M. Guillermo | 6-3,6-4 | |
| ITF W15 Arcadia | 03/14 16:00 | 26 | Elizabeth Mandlik v Lorraine M. Guillermo | 6-4,6-3 | |
| ITF W15 Arcadia | 03/12 21:40 | 25 | Nikki Redelijk v Lorraine M. Guillermo | 1-6,7-6,5-7 | |
| ITF W15 Carson | 03/08 18:15 | 26 | Lorraine M. Guillermo v Natasha Subhash | 5-7,6-7 | |
| ITF W15 Carson | 03/05 18:30 | 25 | Lorraine M. Guillermo v Madison Westby | 6-4,6-2 | |
| ITF W25 Rancho Santa Fe | 02/19 19:30 | 25 | Lorraine M. Guillermo v Kayla Day | 1-6,3-6 | |
| ITF W25 Surprise | 02/11 16:00 | 45 | Lorraine M. Guillermo v Hanna Chang | 6-3,2-6,4-10 | |
| ITF Women Norman | 11/16 18:55 | 27 | Lorraine M. Guillermo v Yuriko Lily Miyazaki | 5-7,7-5,1-6 | |
| ITF Women Norman | 11/15 18:20 | 26 | Nadia Podoroska v Lorraine M. Guillermo | 1-6,6-3,5-7 | |
| ITF Women Norman | 11/13 20:25 | 25 | Hanna Chang v Lorraine M. Guillermo | 4-6,4-6 | |
| ITF Women Lawrence | 11/03 16:00 | 62 | Lorraine M. Guillermo v Natasha Subhash | 5-7,3-6 | |
| ITF Women Toronto | 10/28 14:00 | 54 | Kennedy Shaffer v Lorraine M. Guillermo | 6-4,6-3 | |
| ITF Women Toronto | 10/27 16:35 | 54 | Maria Tanasescu v Lorraine M. Guillermo | 1-6,1-6 | |
| ITF Women Saguenay | 10/21 16:45 | 54 | Pamela Montez v Lorraine M. Guillermo | 6-1,6-3 | |
| ITF Women Saguenay | 10/20 16:10 | 54 | Alice Garcia v Lorraine M. Guillermo | 4-6,3-6 | |
| ITF Women Stockton | 09/30 22:25 | 54 | Lorraine M. Guillermo v Beatrice Gumulya | 5-7,5-7 | |
| ITF Women Templeton | 09/23 21:40 | 54 | Lorraine M. Guillermo v Jennifer Elie | 6-7,4-6 | |
| ITF Women Fort Worth | 08/02 14:00 | 26 | Lorraine M. Guillermo v Maria Mateas | 2-6,2-6 | |
| ITF Women Fort Worth | 07/31 18:10 | 25 | Lorraine M. Guillermo v Hurricane Tyra Black | 7-6,6-0 | |
| ITF Women Ashland Qual | 07/23 16:10 | 54 | Maegan Manasse v Lorraine M. Guillermo | 6-4,6-0 | |
| ITF Women Ashland Qual | 07/22 19:55 | 54 | Madeleine Kobelt v Lorraine M. Guillermo | 6-4,2-6,0-6 | |
| ITF Women Berkeley | 07/18 19:00 | 25 | Lorraine M. Guillermo v Maegan Manasse | 4-6,2-6 | |
| ITF Women Berkeley Qual | 07/17 19:00 | 54 | Sabrina Santamaria v Lorraine M. Guillermo | 6-2,1-6,6-7 | |
| ITF Women Berkeley Qual | 07/16 21:35 | 54 | Nicole Mossmer v Lorraine M. Guillermo | 7-5,3-6,1-6 | |
| ITF Women Berkeley Qual | 07/15 23:40 | 54 | Angelina Gabueva v Lorraine M. Guillermo | 6-3,1-6,2-6 | |
| ITF Women Winnipeg | 07/12 17:25 | 26 | Lorraine M. Guillermo v Erika Sema | 4-6,3-6 | |
| ITF Women Winnipeg | 07/11 16:00 | 25 | Bianca Andreescu v Lorraine M. Guillermo | Retired |