The 2013 Cachantún Cup was a professional tennis tournament played on clay courts. It was the sixth edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Santiago, Chile between 4 and 10 March.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Argentina | Martín Alund | 91 | 1 | |
| Thiemo de Bakker | 110 | 2 | ||
 Brazil | Rogério Dutra da Silva | 115 | 3 | |
| Argentina | Federico Delbonis | 118 | 4 | |
| Antonio Veić | 129 | 5 | ||
| Brazil | João Souza | 132 | 6 | |
| Paul Capdeville | 144 | 7 | ||
| Argentina | Diego Sebastián Schwartzman | 157 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry as a special exempt into the singles main draw:
The following players received entry from the qualifying draw:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Brazil | Marcelo Demoliner | Brazil | João Souza | 196 | 1 | |
 Australia | Jordan Kerr |  Sweden | Andreas Siljeström | 217 | 2 | |
| Argentina | Martín Alund | Argentina | Facundo Bagnis | 268 | 3 | |
| Paul Capdeville | Marcel Felder | 432 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: 2013 Cachantún Cup – Singles.
Facundo Bagnis def. Thiemo de Bakker, 7–6(7–2), 7–6(7–3)See main article: 2013 Cachantún Cup – Doubles.
Marcelo Demoliner / João Souza def. Federico Delbonis / Diego Junqueira, 7–5, 6–1
