See main article: article and 2018 Koblenz Open.
Hans Podlipnik-Castillo and Andrei Vasilevski were the defending champions but chose not to defend their title.
Romain Arneodo and Tristan-Samuel Weissborn won the title after defeating Sander Arends and Antonio Šančić 6–7(4–7), 7–5, [10–6] in the final.