| 2026 Challenger AAT | |
|---|---|
| Date | 12–17 January |
| Edition | 5th |
| Surface | Clay |
| Location | Buenos Aires, Argentina |
| Champions | |
| Singles | |
 Franco Agamenone | |
| Doubles | |
 Mariano Kestelboim /  Marcelo Zormann | |
The 2026 Challenger AAT de TCA was a professional tennis tournament played on clay courts. It was the fifth edition of the tournament which was part of the 2026 ATP Challenger Tour. It took place in Buenos Aires, Argentina between 12 and 17 January 2026.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| ARG | Santiago Rodríguez Taverna | 224 | 1 |
| ARG | Lautaro Midón | 232 | 2 |
| ARG | Andrea Collarini | 242 | 3 |
 BOL | Murkel Dellien | 247 | 4 |
 PER | Juan Pablo Varillas | 253 | 5 |
| ARG | Nicolás Kicker | 257 | 6 |
| BRA | Pedro Boscardin Dias | 273 | 7 |
| BRA | Matheus Pucinelli de Almeida | 298 | 8 |
The following players received wildcards into the singles main draw:
Alexis Gurmendi Dante Pagani Máximo ZeituneThe following players received entry into the singles main draw as alternates:
Mateus Alves João Eduardo SchiesslThe following players received entry from the qualifying draw:
Valerio Aboian 
Joaquín Aguilar Cardozo Juan Estévez Wilson Leite
Ștefan Paloși Lucio RattiThe following player received entry as a lucky loser:
Franco Agamenone def. Andrea Collarini 3–6, 6–4, 6–2. Mariano Kestelboim / Marcelo Zormann def. Alexandru Jecan / Bogdan Pavel 6–3, 6–4.