2018 Challenger ATP Cachantún Cup

The 2018 Challenger ATP Cachantún Cup was a professional tennis tournament played on red clay courts. It was the 11th edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Santiago, Chile between 5 and 10 March 2018.

Seeds

 * 1 Rankings are as of 26 February 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * Marcelo Tomás Barrios Vera
 * Christian Garín
 * Gonzalo Lama
 * Alejandro Tabilo

The following player received entry into the singles main draw as an alternate:
 * 🇷🇸 Peđa Krstin

The following players received entry from the qualifying draw:
 * 🇦🇷 Facundo Argüello
 * 🇦🇷 Pedro Cachin
 * 🇪🇸 Carlos Gómez-Herrera
 * 🇮🇹 Gian Marco Moroni

The following players received entry as lucky losers:
 * 🇦🇷 Hernán Casanova
 * 🇧🇷 João Souza

Singles

 * 🇮🇹 Marco Cecchinato def. 🇪🇸 Carlos Gómez-Herrera 1–6, 6–1, 6–1.

Doubles

 * Romain Arneodo / 🇫🇷 Jonathan Eysseric def. 🇦🇷 Guido Andreozzi / 🇦🇷 Guillermo Durán 7–6(7–4), 1–6, [12–10].