13‑Nov‑2023 | Montevideo CH | Clay | R16 | 329 | 217 | Roman Andres Burruchaga [ARG] d. (Q)Guillen Meza | 4-6 6-4 6-3 | | 0.84 | 1.1% | 5.7% | 76.1% | 53.7% | 38.1% | 4/11 | 2:15 |
13‑Nov‑2023 | Montevideo CH | Clay | R32 | 329 | 124 | (Q)Guillen Meza d. Luciano Darderi [ITA] | 7-6(4) 6-7(4) 6-4 | | 1.03 | 0.8% | 3.9% | 73.2% | 65.6% | 41.2% | 7/12 | 3:13 |
13‑Nov‑2023 | Montevideo CH | Clay | Q2 | 329 | 278 | (8)Guillen Meza d. (3)Renzo Olivo [ARG] | 2-6 7-6(2) 7-6(5) | | 0.99 | 0.0% | 4.4% | 74.6% | 63.5% | 44.8% | 6/12 | 3:21 |
13‑Nov‑2023 | Montevideo CH | Clay | Q1 | 329 | 445 | (8)Guillen Meza d. Adolfo Daniel Vallejo [PAR] | 3-6 6-4 7-6(4) | | 0.98 | 0.9% | 2.8% | 74.5% | 62.0% | 37.0% | 6/12 | 2:57 |
6‑Nov‑2023 | Lima CH | Clay | R16 | 339 | 126 | Mariano Navone [ARG] d. (Q)Guillen Meza | 6-3 6-2 | | 0.69 | 2.2% | 2.2% | 84.4% | 52.6% | 42.9% | 3/7 | 1:29 |
6‑Nov‑2023 | Lima CH | Clay | R32 | 339 | 459 | (Q)Guillen Meza d. Ignacio Buse [PER] | 6-7(2) 6-3 6-4 | | 1.01 | 0.8% | 0.0% | 78.7% | 52.1% | 57.7% | 11/16 | 3:01 |
6‑Nov‑2023 | Lima CH | Clay | Q2 | 339 | 272 | (9)Guillen Meza d. (2)Murkel Alejandro Dellien Velasco [BOL] | 5-7 6-2 6-3 | | 1.13 | 0.0% | 2.3% | 80.7% | 56.3% | 41.2% | 9/15 | 2:51 |
6‑Nov‑2023 | Lima CH | Clay | Q1 | 339 | 410 | (9)Guillen Meza d. Alex Barrena [ARG] | 7-5 6-1 | | 1.60 | 3.8% | 3.8% | 73.6% | 71.8% | 64.3% | 1/2 | |
30‑Oct‑2023 | Guayaquil CH | Clay | R32 | 333 | 225 | Lukas Neumayer [AUT] d. (WC)Guillen Meza | 6-4 2-6 6-4 | | 1.04 | 0.0% | 7.0% | 73.0% | 60.3% | 48.1% | 9/14 | 2:16 |
16‑Oct‑2023 | Santa Fe CH | Clay | Q1 | 329 | 456 | Gonzalo Villanueva [ARG] d. (7)Guillen Meza | 6-3 4-6 6-3 | | 0.86 | 1.1% | 2.1% | 67.0% | 58.7% | 54.8% | 10/14 | 2:37 |
9‑Oct‑2023 | Buenos Aires CH | Clay | Q2 | 369 | 283 | (6)Joao Lucas Reis Da Silva [BRA] d. (12)Guillen Meza | 7-6(5) 7-6(3) | | 0.86 | 0.0% | 4.1% | 74.5% | 64.4% | 40.0% | 6/9 | 2:18 |
9‑Oct‑2023 | Buenos Aires CH | Clay | Q1 | 369 | 404 | (12)Guillen Meza d. Gonzalo Bueno [PER] | 6-4 2-6 6-3 | | 1.03 | 0.0% | 2.4% | 73.5% | 57.4% | 45.5% | 8/13 | 2:13 |
25‑Sep‑2023 | M25 Lujan | Clay | F | 383 | 561 | (2)Guillen Meza d. Luciano Emanuel Ambrogi [ARG] | 3-6 6-3 7-6(3) | | | | | | | | | |
25‑Sep‑2023 | M25 Lujan | Clay | SF | 383 | 404 | (2)Guillen Meza d. (3)Gonzalo Bueno [PER] | 6-3 6-2 | | | | | | | | | |
25‑Sep‑2023 | M25 Lujan | Clay | QF | 383 | 852 | (2)Guillen Meza d. Mateo Barreiros Reyes [BRA] | 6-4 4-6 6-4 | | | | | | | | | |
25‑Sep‑2023 | M25 Lujan | Clay | R16 | 383 | 613 | (2)Guillen Meza d. Bruno Kuzuhara [USA] | 7-6(7) 6-1 | | | | | | | | | |
25‑Sep‑2023 | M25 Lujan | Clay | R32 | 383 | 1358 | (2)Guillen Meza d. (WC)Santiago Bramajo [ARG] | 7-5 RET | | | | | | | | | |
18‑Sep‑2023 | M15 Punta del Este | Clay | F | 385 | 613 | (3)Bruno Kuzuhara [USA] d. (1)Guillen Meza | 6-7(3) 6-1 6-3 | | | | | | | | | |
18‑Sep‑2023 | M15 Punta del Este | Clay | SF | 385 | 656 | (1)Guillen Meza d. (4)Franco Roncadelli [URU] | 7-5 7-6(2) | | | | | | | | | |
18‑Sep‑2023 | M15 Punta del Este | Clay | QF | 385 | 1350 | (1)Guillen Meza d. (Q)Bautista Vilicich [ARG] | 6-4 3-6 6-4 | | | | | | | | | |
18‑Sep‑2023 | M15 Punta del Este | Clay | R16 | 385 | 1232 | (1)Guillen Meza d. (Q)Thiago Cigarran [ARG] | 6-3 6-2 | | | | | | | | | |
18‑Sep‑2023 | M15 Punta del Este | Clay | R32 | 385 | | (1)Guillen Meza d. (WC)Juan Martin Fumeaux Buenaventura [URU] | 6-3 6-1 | | | | | | | | | |
15‑Sep‑2023 | Davis Cup WG2 R1: MON vs ECU | Clay | RR | 387 | 317 | Guillen Meza d. Valentin Vacherot [MON] | 3-6 7-6(4) 7-6(4) | | | | | | | | | |
21‑Aug‑2023 | Lima CH | Clay | F | 506 | 559 | Guillen Meza d. Blaise Bicknell [JAM] | 7-6(3) 6-1 | | 1.09 | 1.2% | 2.4% | 85.7% | 70.8% | 50.0% | 3/3 | 1:36 |
21‑Aug‑2023 | Lima CH | Clay | SF | 506 | 303 | Guillen Meza d. (2)Renzo Olivo [ARG] | 7-5 7-5 | | 1.19 | 0.0% | 6.0% | 81.9% | 63.2% | 40.0% | 6/10 | 2:05 |
21‑Aug‑2023 | Lima CH | Clay | QF | 506 | 738 | Guillen Meza d. (WC)Arklon Huertas Del Pino [PER] | 6-2 5-7 6-4 | | 1.03 | 0.0% | 8.0% | 67.8% | 59.3% | 39.3% | 2/8 | 2:31 |
21‑Aug‑2023 | Lima CH | Clay | R16 | 506 | 343 | Guillen Meza d. (5)Gustavo Heide [BRA] | 6-2 2-6 7-6(4) | | 0.97 | 1.1% | 5.3% | 73.7% | 57.1% | 44.0% | 10/16 | 2:26 |
21‑Aug‑2023 | Lima CH | Clay | R32 | 506 | 462 | Guillen Meza d. Valerio Aboian [ARG] | 6-1 6-2 | | 1.97 | 2.3% | 11.4% | 72.7% | 75.0% | 58.3% | 1/1 | 1:08 |
14‑Aug‑2023 | M25 Trujillo | Clay | R32 | 565 | 1017 | Juan Sebastian Gomez [COL] d. Guillen Meza | 2-6 6-4 6-1 | | | | | | | | | |
7‑Aug‑2023 | M25 Arequipa | Clay | F | 564 | 717 | (1)Guillen Meza d. (7)Guido Ivan Justo [ARG] | 6-4 6-3 | | | | | | | | | |
7‑Aug‑2023 | M25 Arequipa | Clay | SF | 564 | 1114 | (1)Guillen Meza d. Ignacio Antonio Becerra Otarola [CHI] | 6-0 6-2 | | | | | | | | | |
7‑Aug‑2023 | M25 Arequipa | Clay | QF | 564 | 920 | (1)Guillen Meza d. Juan Manuel La Serna [ARG] | 6-4 6-4 | | | | | | | | | |
7‑Aug‑2023 | M25 Arequipa | Clay | R16 | 564 | | (1)Guillen Meza d. (WC)Josue Guzman [PER] | 6-1 6-2 | | | | | | | | | |
7‑Aug‑2023 | M25 Arequipa | Clay | R32 | 564 | 1088 | (1)Guillen Meza d. Lucio Ratti [ARG] | 6-2 6-4 | | | | | | | | | |
24‑Jul‑2023 | Salinas CH | Hard | R32 | 552 | 253 | (8)Evgeny Donskoy [RUS] d. (WC)Guillen Meza | 6-4 2-6 6-3 | | 0.94 | 2.5% | 4.9% | 63.0% | 76.5% | 40.0% | 7/10 | 2:13 |
3‑Jul‑2023 | Santa Fe CH | Clay | QF | 601 | 248 | (4)Francisco Comesana [ARG] d. (Q)Guillen Meza | 6-0 7-6(3) | | 0.73 | 0.0% | 9.6% | 69.9% | 60.8% | 31.8% | 7/11 | 1:42 |
3‑Jul‑2023 | Santa Fe CH | Clay | R16 | 601 | 536 | (Q)Guillen Meza d. Matias Soto [CHI] | 6-3 6-1 | | 2.06 | 0.0% | 2.4% | 85.7% | 69.4% | 66.7% | 2/4 | 1:04 |
3‑Jul‑2023 | Santa Fe CH | Clay | R32 | 601 | 337 | (Q)Guillen Meza d. (5)Gustavo Heide [BRA] | 6-4 6-4 | | 1.11 | 1.4% | 1.4% | 77.1% | 66.7% | 50.0% | 5/6 | 1:47 |
19‑Jun‑2023 | M15 Store | Clay | F | 727 | 1103 | Guillen Meza d. (Q)Dominik Kellovsky [CZE] | 6-4 6-0 | | | | | | | | | |
19‑Jun‑2023 | M15 Store | Clay | SF | 727 | 743 | Guillen Meza d. (3)Bor Artnak [SLO] | 7-6(6) 6-1 | | | | | | | | | |
19‑Jun‑2023 | M15 Store | Clay | QF | 727 | 695 | Guillen Meza d. (5)Pawel Cias [POL] | 2-6 6-0 6-4 | | | | | | | | | |
19‑Jun‑2023 | M15 Store | Clay | R16 | 727 | 1197 | Guillen Meza d. (Q)Zaharije Zak Talic [AUS] | 6-0 6-1 | | | | | | | | | |
19‑Jun‑2023 | M15 Store | Clay | R32 | 727 | 620 | Guillen Meza d. (1)Tomas Farjat [ARG] | 6-1 4-0 RET | | | | | | | | | |
12‑Jun‑2023 | M15 Litija | Clay | F | 723 | 693 | Pawel Cias [POL] d. Guillen Meza | 6-3 6-1 | | | | | | | | | |
12‑Jun‑2023 | M15 Litija | Clay | SF | 723 | 394 | Guillen Meza d. (2)Cezar Cretu [ROU] | 6-2 6-1 | | | | | | | | | |
12‑Jun‑2023 | M15 Litija | Clay | QF | 723 | 646 | Guillen Meza d. (6)Bor Artnak [SLO] | 6-3 6-4 | | | | | | | | | |
12‑Jun‑2023 | M15 Litija | Clay | R16 | 723 | 565 | Guillen Meza d. (3)Enrico Dalla Valle [ITA] | 6-2 6-4 | | | | | | | | | |
12‑Jun‑2023 | M15 Litija | Clay | R32 | 723 | 1795 | Guillen Meza d. (Q)Matteo Fondriest [ITA] | 7-6(6) 6-0 | | | | | | | | | |
5‑Jun‑2023 | M15 Nyiregyhaza | Clay | R16 | 747 | 213 | (1)Dragos Nicolae Madaras [ROU] d. Guillen Meza | 7-6(0) 0-6 6-0 | | | | | | | | | |
5‑Jun‑2023 | M15 Nyiregyhaza | Clay | R32 | 747 | 863 | Guillen Meza d. Tyler Zink [USA] | 6-3 6-4 | | | | | | | | | |
29‑May‑2023 | M15 Kursumlijska Banja | Clay | SF | 747 | 1360 | (Q)Luka Pavlovic [FRA] d. Guillen Meza | 7-6(1) 6-4 | | | | | | | | | |
29‑May‑2023 | M15 Kursumlijska Banja | Clay | QF | 747 | 1294 | Guillen Meza d. (LL)Milan Drinic [SRB] | 6-2 3-6 7-6(4) | | | | | | | | | |
29‑May‑2023 | M15 Kursumlijska Banja | Clay | R16 | 747 | 396 | Guillen Meza d. (1)Samuel Vincent Ruggeri [ITA] | 6-0 6-1 | | | | | | | | | |
29‑May‑2023 | M15 Kursumlijska Banja | Clay | R32 | 747 | 1076 | Guillen Meza d. (Q)Lucio Ratti [ARG] | 6-2 6-2 | | | | | | | | | |
22‑May‑2023 | M15 Kursumlijska Banja | Clay | R32 | 739 | 608 | (4)Tomas Farjat [ARG] d. Guillen Meza | 6-3 2-6 6-2 | | | | | | | | | |
15‑May‑2023 | M15 Krsko | Clay | R32 | 748 | 344 | (1)Lucas Gerch [GER] d. Guillen Meza | 6-3 7-6(3) | | | | | | | | | |
10‑Apr‑2023 | M15 Santo Domingo de los Tsachilas | Clay | QF | 770 | 623 | (6)Aleksandre Metreveli [GEO] d. Guillen Meza | 4-6 6-4 6-3 | | | | | | | | | |
10‑Apr‑2023 | M15 Santo Domingo de los Tsachilas | Clay | R16 | 770 | 480 | Guillen Meza d. (1)Leonardo Aboian [ARG] | 6-4 6-1 | | | | | | | | | |
10‑Apr‑2023 | M15 Santo Domingo de los Tsachilas | Clay | R32 | 770 | 786 | Guillen Meza d. Nicolas Buitrago [COL] | 6-3 5-7 7-6(3) | | | | | | | | | |
3‑Apr‑2023 | M15 Santo Domingo de los Tsachilas | Clay | QF | 767 | 787 | Franco Roncadelli [URU] d. Guillen Meza | 6-4 6-4 | | | | | | | | | |
3‑Apr‑2023 | M15 Santo Domingo de los Tsachilas | Clay | R16 | 767 | 1147 | Guillen Meza d. (Q)Mateo Barreiros Reyes [BRA] | 6-1 6-4 | | | | | | | | | |
3‑Apr‑2023 | M15 Santo Domingo de los Tsachilas | Clay | R32 | 767 | 479 | Guillen Meza d. (1)Leonardo Aboian [ARG] | 4-6 6-2 6-0 | | | | | | | | | |
20‑Mar‑2023 | M25 Mosquera | Clay | R16 | 769 | 820 | (WC)Alejandro Hoyos Franco [COL] d. (Q)Guillen Meza | 1-6 7-6(1) 6-1 | | | | | | | | | |
20‑Mar‑2023 | M25 Mosquera | Clay | R32 | 769 | 465 | (Q)Guillen Meza d. Jorge Brian Panta Herreros [PER] | 6-3 6-3 | | | | | | | | | |
13‑Mar‑2023 | M25 Anapoima | Clay | R32 | 764 | 413 | (7)Eduardo Ribeiro [BRA] d. Guillen Meza | 5-7 6-4 6-0 | | | | | | | | | |
27‑Feb‑2023 | M15 Naples FL | Clay | R32 | 777 | 1085 | (Q)Isaiah Strode [USA] d. Guillen Meza | 6-3 6-2 | | | | | | | | | |
20‑Feb‑2023 | M15 Naples FL | Clay | R16 | 750 | 1134 | Rei Sakamoto [JPN] d. Guillen Meza | 4-6 7-5 6-3 | | | | | | | | | |
20‑Feb‑2023 | M15 Naples FL | Clay | R32 | 750 | 498 | Guillen Meza d. (1)Ignacio Monzon [ARG] | 6-2 6-0 | | | | | | | | | |
6‑Feb‑2023 | M15 Palm Coast FL | Clay | R32 | 735 | | (WC)Toby Alex Kodat [USA] d. Guillen Meza | 6-3 6-2 | | | | | | | | | |