| Challenger Antofagasta | 09/24 16:40 | 25 | [112] Camilo Ugo Carabelli v Alvaro Guillen Meza [260] | 7-6,6-7,7-6 | |
| Challenger Cali | 09/17 15:30 | 25 | [259] Alvaro G Meza v Juan Carlos Aguilar [382] | 6-2,3-6,4-6 | |
| US Open | 08/19 16:25 | 14 | [184] Denis Yevseyev v Alvaro Guillen Meza [215] | 6-0,6-1 | |
| Challenger Bogota | 08/08 15:30 | 26 | [423] Karue Sell v Alvaro Guillen Meza [218] | 6-3,6-4 | |
| Challenger Bogota | 08/06 21:10 | 25 | Alejandro Arcila v Alvaro Guillen Meza | 6-7,4-6 | |
| Challenger Verona | 07/26 12:35 | 27 | [229] Alvaro Guillen Meza v Max Hans Rehberg [416] | 4-6,6-3,5-7 | |
| Challenger Verona | 07/25 09:00 | 26 | [247] Francesco Maestrelli v Alvaro Guillen Meza [229] | 4-6,6-3,3-6 | |
| Challenger Verona | 07/23 11:35 | 25 | [212] Kyrian Jacquet v Alvaro Guillen Meza [229] | 2-6,6-7 | |
| Challenger Amersfoort | 07/19 12:10 | 27 | [248] Alvaro Guillen Meza v Daniel Rincon [251] | 3-6,1-6 | |
| Challenger Amersfoort | 07/18 11:10 | 26 | [152] Juan Manuel Cerundolo v Alvaro Guillen Meza [248] | 6-4,0-6,4-6 | |
| Challenger Amersfoort | 07/16 08:30 | 25 | [334] Franco Agamenone v Alvaro Guillen Meza [248] | 2-6,2-6 | |
| ITF M25 Kassel | 07/13 15:25 | 28 | [240] Alvaro Guillen Meza v Raphael Collignon [358] | 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. 1 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.