| Challenger Temuco | 11/27 13:00 | 26 | [276] Alvaro Guillen Meza v Daniel Dutra Da Silva [323] | 6-7,3-6 | |
| Challenger Temuco | 11/26 16:05 | 25 | [284] Mateus Alves v Alvaro Guillen Meza [276] | 4-6,6-4,6-7 | |
| Challenger Sao Paulo | 11/18 16:20 | 25 | [291] Juan C P Angelo v Alvaro Guillen Meza [274] | 6-4,6-1 | |
| Challenger Montevideo | 11/12 19:30 | 25 | [260] Alvaro Guillen Meza v Mateus Alves [282] | 7-5,4-6,6-7 | |
| Challenger Montevideo | 11/11 21:00 | 25 | Alvaro Guillen Meza v Pedro Cachin | CANC | |
| Challenger Curitiba | 10/25 18:00 | 27 | [149] Juan Manuel Cerundolo v Alvaro Guillen Meza [264] | 6-3,6-4 | |
| Challenger Curitiba | 10/24 17:10 | 26 | Alvaro Guillen Meza v Jose Pereira | 6-1,6-1 | |
| Challenger Curitiba | 10/22 13:00 | 25 | [394] Joao Lucas Reis da Silva v Alvaro Guillen Meza [264] | 6-7,4-6 | |
| Challenger Campinas | 10/19 14:00 | 28 | [298] Alvaro Guillen Meza v Juan Pablo Ficovich [204] | 2-6,4-6 | |
| Challenger Campinas | 10/18 15:45 | 27 | [187] Juan Pablo Varillas v Alvaro Guillen Meza [298] | 3-6,6-4,4-6 | |
| Challenger Campinas | 10/17 16:25 | 26 | [298] Alvaro Guillen Meza v Hugo Dellien [105] | 6-2,1-6,6-4 | |
| Challenger Campinas | 10/15 18:50 | 25 | [379] Valerio Aboian v Alvaro Guillen Meza [298] | 3-6,1-6 |
Álvaro Guillén Meza (born 2 January 2003) is an Ecuadorian tennis player. He has a career high ATP singles ranking of world No. 215 achieved on 12 August 2024 and a doubles ranking of No. 400 achieved on 22 July 2024. He is currently the No. 2 Ecuadorian tennis player.
Guillén Meza represents Ecuador at the Davis Cup, where he has a W/L record of 1–1.
At 20 years old, he became the youngest Ecuadorian champion since Giovanni Lapentti in 2003 after winning the 2023 Lima Challenger.