9‑Dec‑2019 | M15 Cancun | Hard | R16 | 1111 | 1668 | (Q)Felipe Martinez Sarrasague [ARG] d. Pierce | 6-2 6-4 | | | | | | | | | |
9‑Dec‑2019 | M15 Cancun | Hard | R32 | 1111 | 929 | Pierce d. Ignacio Carou [ARG] | 6-3 6-2 | | | | | | | | | |
18‑Nov‑2019 | M15 Austin TX | Hard | R32 | 1108 | 733 | (6)Hady Habib [LIB] d. Pierce | 6-3 6-3 | | | | | | | | | |
21‑Oct‑2019 | M15 Cancun | Hard | R32 | 1101 | 658 | (6)Juan Sebastian Gomez [COL] d. Pierce | 6-3 6-3 | | | | | | | | | |
14‑Oct‑2019 | M15 Cancun | Hard | R32 | 1105 | 634 | Federico Zeballos [BOL] d. Pierce | 6-2 6-3 | | | | | | | | | |
7‑Oct‑2019 | M15 Cancun | Hard | R32 | 1161 | 906 | Mwendwa Mbithi [USA] d. Pierce | 6-3 6-4 | | | | | | | | | |
30‑Sep‑2019 | M15 Santa Tecla | Hard | R16 | 1151 | 719 | Eric Vanshelboim [UKR] d. Pierce | 6-1 6-2 | | | | | | | | | |
30‑Sep‑2019 | M15 Santa Tecla | Hard | R32 | 1151 | | Pierce d. Maksym Khalus [UKR] | 6-1 6-0 | | | | | | | | | |
23‑Sep‑2019 | M15 Cancun | Hard | R32 | 1207 | 1107 | Tyler Mercier [USA] d. Pierce | 7-6(2) 3-6 7-6(8) | | | | | | | | | |
16‑Sep‑2019 | M15 Cancun | Hard | R16 | 1195 | 743 | (6)Cristian Rodriguez [COL] d. Pierce | 6-3 6-3 | | | | | | | | | |
16‑Sep‑2019 | M15 Cancun | Hard | R32 | 1195 | 1033 | Pierce d. Kalman L Boyd [USA] | 6-1 6-4 | | | | | | | | | |
9‑Sep‑2019 | M15 Cancun | Hard | R32 | 1194 | | Taha Baadi [CAN] d. Pierce | 6-1 7-5 | | | | | | | | | |
29‑Jul‑2019 | M15 Cancun | Hard | R16 | | | (2)Gage Brymer [USA] d. (WC)Pierce | 6-2 4-6 7-5 | | | | | | | | | |
29‑Jul‑2019 | M15 Cancun | Hard | R32 | | | (WC)Pierce d. Michel Alexandre Fortin [CAN] | 6-2 3-6 6-4 | | | | | | | | | |
22‑Jul‑2019 | M15 Cancun | Hard | QF | | | Christian Langmo [USA] d. (Q)Pierce | 6-4 6-4 | | | | | | | | | |
22‑Jul‑2019 | M15 Cancun | Hard | R16 | | 636 | (Q)Pierce d. (2)Jaimee Floyd Angele [FRA] | 6-4 6-4 | | | | | | | | | |
22‑Jul‑2019 | M15 Cancun | Hard | R32 | | | (Q)Pierce d. Nicholas Alexander Reyes [USA] | 6-0 7-5 | | | | | | | | | |
15‑Jul‑2019 | M15 Cancun | Hard | R32 | | | Blu Baker [GBR] d. (WC)Pierce | 2-6 6-2 6-1 | | | | | | | | | |
8‑Jul‑2019 | M15 Cancun | Hard | QF | | 510 | Jack Draper [GBR] d. Pierce | 6-3 6-3 | | | | | | | | | |
8‑Jul‑2019 | M15 Cancun | Hard | R16 | | | Pierce d. Ben Jones [GBR] | 6-3 6-4 | | | | | | | | | |
8‑Jul‑2019 | M15 Cancun | Hard | R32 | | | Pierce d. (Q)Joaquin Marquez [MEX] | 7-5 6-4 | | | | | | | | | |
1‑Jul‑2019 | M15 Cancun | Hard | R32 | | | Juan Alejandro Hernandez Serrano [MEX] d. (Q)Pierce | 6-1 6-4 | | | | | | | | | |
10‑Jun‑2019 | M15 Cancun | Hard | R32 | | | Jorge Brian Panta Herreros [PER] d. Pierce | 6-2 7-5 | | | | | | | | | |
3‑Jun‑2019 | M15 Cancun | Hard | R32 | | | (Q)Oleg Khotkov [UKR] d. Pierce | 3-6 6-4 6-3 | | | | | | | | | |
6‑May‑2019 | M15 Cancun | Hard | R32 | | | Nicholas Bybel [USA] d. Pierce | 6-2 6-3 | | | | | | | | | |