The 2015 Challenger ATP Cachantún Cup was a professional tennis tournament played on red clay courts. It was the 8th edition of the tournament which was part of the 2015 ATP Challenger Tour. It took place in Santiago, Chile between 9 and 15 March 2015.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Brazil | ||||
 Colombia | Alejandro González | 90 | 2 | |
 Argentina | Máximo González | 96 | 3 | |
| Argentina | Facundo Bagnis | 120 | 4 | |
| Argentina | Horacio Zeballos | 138 | 5 | |
| Argentina | Facundo Argüello | 140 | 6 | |
| Hans Podlipnik Castillo | 177 | 7 | ||
| Argentina | Renzo Olivo | 190 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Ricardo Hocevar Patricio HerasSee main article: 2015 Challenger ATP Cachantún Cup – Singles.
Facundo Bagnis def. Guilherme Clezar, 6–2, 5–7, 6–2See main article: 2015 Challenger ATP Cachantún Cup – Doubles.
Andrés Molteni / Guido Pella def. Andrea Collarini / Máximo González, 7–6(9–7), 3–6, [10–4]