| ITF W15 Cancún | 05/12 15:00 | 29 | Marcela Zacarias v Maria Jose P Ramirez | 6-3,6-1 | |
| ITF W15 Cancún | 05/11 14:00 | 28 | Marcela Zacarias v Madison Westby | 6-2,7-5 | |
| ITF W15 Cancún | 05/10 14:00 | 27 | Marcela Zacarias v Eduarda Piai | 7-5,6-0 | |
| ITF W15 Cancún | 05/09 14:00 | 26 | Marcela Zacarias v Lian Tran | 6-4,6-0 | |
| ITF W15 Cancún | 05/08 19:10 | 25 | Marcela Zacarias v Mariana J Bustillo | 6-1,6-0 | |
| ITF W15 Cancún | 04/28 15:00 | 29 | [404] Ana Sofia Sanchez v Marcela Zacarias [425] | 0-6,5-7 | |
| ITF W15 Cancún | 04/27 15:00 | 28 | Andrea R Villarreal v Marcela Zacarias | 3-6,3-6 | |
| ITF W15 Cancún | 04/26 14:00 | 27 | Alba C Marin v Marcela Zacarias | 0-6,4-6 | |
| ITF W15 Cancún | 04/25 14:00 | 26 | Eimi Friant v Marcela Zacarias | 4-6,1-6 | |
| ITF W15 Cancún | 04/23 17:10 | 25 | Marian G P Cano v Marcela Zacarias | 1-6,3-6 | |
| ITF W15 Cancún | 04/21 16:00 | 29 | Andrea R Villarreal v Marcela Zacarias | 4-6,0-6 | |
| ITF W15 Cancún | 04/20 14:00 | 28 | Nicole Nadel v Marcela Zacarias | 1-6,1-6 | |
| ITF W15 Cancún | 04/19 14:00 | 27 | [488] Maria Jose P Ramirez v Marcela Zacarias [420] | 2-6,1-6 | |
| ITF W15 Cancún | 04/18 14:00 | 26 | Zoe Gwen Scandalis v Marcela Zacarias | 1-6,3-6 | |
| ITF W15 Cancún | 04/16 16:05 | 25 | Alba Carrillo Marin v Marcela Zacarias | 3-6,3-6 | |
| WTA Monterrey | 03/30 18:15 | 45 | [151] Beatriz Haddad Maia v Marcela Zacarias [410] | 6-2,6-4 | |
| ITF W25 Irapuato | 03/06 23:00 | 25 | [366] Marcela Zacarias v Andrea Gamiz [352] | 5-7,0-6 | |
| ITF Fort Worth - Femenino | 08/03 14:30 | 27 | [333] Robin Anderson v Marcela Zacarias [377] | 6-4,2-6,6-4 | |
| ITF Fort Worth - Femenino | 08/02 14:00 | 26 | McCartney Kessler v Marcela Zacarias | 2-6,7-5,4-6 | |
| ITF Fort Worth - Femenino | 08/01 14:00 | 25 | Alexa Ryngler v Marcela Zacarias | Retired | |
| ITF Granby - Femenino | 07/24 22:00 | 25 | [334] Robin Anderson v Marcela Zacarias [363] | 6-4,4-6,6-2 | |
| ITF Gatineau - Femenino | 07/17 15:45 | 25 | [325] Robin Anderson v Marcela Zacarias [367] | 6-1,6-2 | |
| ITF Winnipeg - Femenino | 07/11 15:00 | 26 | [288] Sophie Chang v Marcela Zacarias [372] | 6-7,7-5,7-5 | |
| ITF Winnipeg - Femenino | 07/09 15:00 | 25 | Mai Hontama v Marcela Zacarias | 1-6,0-6 | |
| Fed Cup 2018 | 06/23 17:35 | 29 | Marcela Zacarias v Anastasia Iamachkine | 7-5,6-1 | |
| Fed Cup 2018 | 06/22 16:10 | - | Marcela Zacarias v Kelly Williford | 6-4,6-1 | |
| Fed Cup 2018 | 06/21 15:15 | - | Marcela Zacarias v Gabrielle Leslie | 6-0,6-0 | |
| ITF Sumter - Femenino | 06/15 13:00 | 27 | [388] Marcela Zacarias v Ashley Lahey [470] | 5-7,7-5,3-6 | |
| ITF Sumter - Femenino | 06/14 13:00 | 26 | Marcela Zacarias v Olga Govortsova | 6-4,6-1 | |
| ITF Sumter - Femenino | 06/13 15:30 | 25 | Marcela Zacarias v McCartney Kessler | 6-3,6-2 |