2018 Milex Open

The 2018 Milex Open was a professional tennis tournament played on green clay courts. It was the fourth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Santo Domingo, Dominican Republic between 8 and 13 October 2018.

Seeds

 * 1 Rankings were as of 1 October 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇩🇴 Víctor Estrella Burgos
 * 🇪🇨 Emilio Gómez
 * 🇩🇴 José Hernández-Fernández
 * 🇩🇴 José Olivares

The following players received entry into the singles main draw using protected rankings:
 * 🇨🇴 Santiago Giraldo
 * 🇦🇹 Jürgen Melzer

The following players received entry into the singles main draw as alternates:
 * 🇧🇷 Thomaz Bellucci
 * 🇦🇷 Pedro Cachin

The following players received entry from the qualifying draw:
 * 🇦🇷 Federico Coria
 * Martín Cuevas
 * 🇨🇴 Alejandro Gómez
 * 🇵🇪 Juan Pablo Varillas

Singles

 * Christian Garín def. 🇦🇷 Federico Delbonis 6–4, 5–7, 6–4.

Doubles

 * 🇮🇳 Leander Paes / 🇲🇽 Miguel Ángel Reyes-Varela def. Ariel Behar / 🇪🇨 Roberto Quiroz 4–6, 6–3, [10–5].