Round: 1
| Las Vegas, Singles W-ITF-USA-08A | 2020/03/02 18:00 | Charlotte Chavatipon v Guillermo, Lorraine M | 0-6,6-3,10-4 |
| ITF W15 Norman | 2019/10/03 15:00 | Guillermo, Lorraine M v Charlotte Chavatipon | 6-3,6-7,6-4 |
| UTR Pro Tennis Series California Women | 2020/07/06 16:00 | Whittle, Sophia v Guillermo, Lorraine M | 6-4,6-2 |
| UTR Pro Tennis Series California Women | 2020/06/27 21:00 | Whittle, Sophia v Guillermo, Lorraine M | 2-6,6-4,10-7 |
| UTR Pro Tennis Series California Women | 2020/06/27 17:25 | Wijesundera, Rushri v Guillermo, Lorraine M | 1-6,6-1,9-11 |
| US Pro Tennis Series East Coast Women | 2020/06/26 19:00 | Guillermo, Lorraine M v Closs, Mary | 6-4,4-6,7-10 |
| US Pro Tennis Series East Coast Women | 2020/06/26 17:15 | Guillermo, Lorraine M v Montez, Pamela | 5-7,2-6 |
| US Pro Tennis Series West Coast Women | 2020/06/24 19:35 | Guillermo, Lorraine M v Giuliana Olmos | 4-6,3-6 |
| US Pro Tennis Series West Coast Women | 2020/06/24 17:50 | Kayla Day v Guillermo, Lorraine M | 6-2,6-2 |
| US Pro Tennis Series West Coast Women | 2020/06/22 19:50 | Wijesundera, Rushri v Guillermo, Lorraine M | 1-6,4-6 |
| UTR Pro Tennis Series California Women | 2020/07/06 17:15 | Montez, Pamela v Charlotte Chavatipon | 6-4,6-1 |
| Irapuato, Singles W-ITF-MEX-02A | 2020/03/10 17:00 | Lister, Cornelia v Charlotte Chavatipon | 4-6,7-6,6-2 |
| Irapuato, Singles W-ITF-MEX-02A | 2020/03/08 17:30 | Maria Jose Portillo Ramirez v Charlotte Chavatipon | 5-7,6-3,6-10 |
| Las Vegas, Singles W-ITF-USA-08A | 2020/03/03 18:00 | Sewing, Sofia v Charlotte Chavatipon | 6-3,6-4 |
| Las Vegas, Singles W-ITF-USA-08A | 2020/03/02 18:00 | Charlotte Chavatipon v Guillermo, Lorraine M | 0-6,6-3,10-4 |
| Rancho Santa Fe, Ca, Singles W-ITF-USA-05A | 2020/02/23 19:00 | Eudice Chong v Charlotte Chavatipon | 6-2,6-3 |
| ITF W25 Vero Beach | 2020/01/20 16:00 | Osaka, Mari v Charlotte Chavatipon | 1-6,7-6,10-5 |
| ITF W25 Daytona Beach | 2020/01/14 16:40 | Guiomar Maristany Zuleta De Reales v Charlotte Chavatipon | 6-4,6-3 |