The 2011 Cachantún Cup was a professional tennis tournament played on clay courts. It was the sixth edition of the tournament which was part of the 2011 ATP Challenger Tour. It took place in Santiago, Chile between 7 and 13 March 2011.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Argentina | Horacio Zeballos | 100 | 1 | |
| Argentina | Máximo González | 123 | 2 | |
 Brazil | João Souza | 126 | 3 | |
 France | Éric Prodon | 136 | 4 | |
| Argentina | Diego Junqueira | 163 | 5 | |
| Paul Capdeville | 165 | 6 | ||
| Brazil | Rogério Dutra da Silva | 166 | 7 | |
| Franko Škugor | 167 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
José Pereira Diego Schwartzman
Stefano TravagliaSee main article: 2011 Cachantún Cup – Singles. Máximo González def. Éric Prodon, 7–5, 0–6, 6–2
See main article: 2011 Cachantún Cup – Doubles. Máximo González / Horacio Zeballos def. Guillermo Rivera Aránguiz / Cristóbal Saavedra-Corvalán, 6–3, 6–4