Stadium: Court 11 Round: 25
| ITF Women Rancho Santa Fe | 2018/02/22 20:40 | Guillermo, Lorraine M v Ann Li | 6-7,3-6 |
| ITF Women Rancho Santa Fe | 2018/02/21 22:50 | Kayla Day v Guillermo, Lorraine M | 3-6,6-7 |
| ITF Women Rancho Santa Fe Qual | 2018/02/20 18:00 | Guillermo, Lorraine M v Larcher de Brito, Michele | 6-2,6-4 |
| ITF Women Rancho Santa Fe Qual | 2018/02/19 17:30 | Caroline Werner v Guillermo, Lorraine M | 3-6,2-6 |
| Surprise, Singles Qualifying W-WITF-USA-05A | 2018/02/11 20:00 | Guillermo, Lorraine M v Marine Partaud | 4-6,5-7 |
| Wesley Chapel, Singles Qualifying W-WITF-USA-03A | 2018/01/21 14:30 | Reka-Luca Jani v Guillermo, Lorraine M | 5-7,6-2,6-2 |
| ITF Women Orlando Qual | 2018/01/14 15:00 | Guillermo, Lorraine M v Dasha Ivanova | 4-6,6-2,4-6 |
| Daytona Beach, Singles Qualifying W-WITF-USA-01A | 2018/01/07 15:00 | Pierson, Rachel May v Guillermo, Lorraine M | 6-4,7-5 |
| Jackson, Singles W-WITF-USA-09A | 2018/04/06 16:00 | Stewart, Katerina v Hendler, Tamaryn | 6-0,6-0 |
| Jackson, Singles W-WITF-USA-09A | 2018/04/05 15:00 | Hendler, Tamaryn v Sofia Shapatava | 7-6,6-3 |
| Jackson, Singles W-WITF-USA-09A | 2018/04/04 16:35 | Hendler, Tamaryn v Marker, Lauren | 6-3,6-1 |
| Wesley Chapel, Singles W-WITF-USA-03A | 2018/01/25 17:00 | Hendler, Tamaryn v Olga Danilovic | 6-4,1-6,2-6 |
| Wesley Chapel, Singles W-WITF-USA-03A | 2018/01/24 17:55 | Ulrikke Eikeri v Hendler, Tamaryn | 7-5,4-6,2-6 |
| Wesley Chapel, Singles Qualifying W-WITF-USA-03A | 2018/01/23 17:40 | Wachaczyk, Julia v Hendler, Tamaryn | 0-6,6-0,4-6 |
| Wesley Chapel, Singles Qualifying W-WITF-USA-03A | 2018/01/22 16:00 | Raszkiewics, Eva v Hendler, Tamaryn | 2-6,0-6 |
| Wesley Chapel, Singles Qualifying W-WITF-USA-03A | 2018/01/21 16:30 | Uzcategui, Aymet v Hendler, Tamaryn | 3-6,3-6 |