2018 Challenger ATP Cachantún Cup

Country	Player	Rank1	Seed
POR	Gastão Elias	102	1
ITA	Marco Cecchinato	103	2
BRA	Rogério Dutra Silva	106	3
POR	Pedro Sousa	121	4
SVK	Andrej Martin	124	5
BRA	Thiago Monteiro	125	6
ARG	Carlos Berlocq	131	7
BRA	Thomaz Bellucci	132	8

• ¹ Rankings are as of 26 February 2018.^[1]

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

• Marco Cecchinato def. Carlos Gómez-Herrera 1–6, 6–1, 6–1.

• Romain Arneodo / Jonathan Eysseric def. Guido Andreozzi / Guillermo Durán 7–6^(7–4), 1–6, [12–10].