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Marin and Tomislav Draganja were the defending champions, but only Tomislav chose to defend his title, partnering Alessandro Giannessi. Tomislav Draganja lost in the quarterfinals to Andrej Martin and Hans Podlipnik Castillo.

Martin and Podlipnik Castillo won the title after defeating Laurynas Grigelis and Alessandro Motti 7–5, 4–6, in the final.

Seeds

1. Kevin Krawietz / Andreas Mies (quarterfinals)
2. Ante Pavić / Antonio Šančić (first round)
3. Julian Ocleppo / Andrea Vavassori (first round)
4. Nikola Ćaćić / Tristan-Samuel Weissborn (quarterfinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• SE = Special exempt
• PR = Protected ranking
• ITF = ITF entry
• JE = Junior exempt
• w/o = Walkover
• r = Retired
• d = Defaulted
• SR = Special ranking

	First round							Quarterfinals							Semifinals							Final
	1	K Krawietz A Mies	7	6
		T Lipovšek Puches JI Londero	6	4				1	K Krawietz A Mies	0	0
	WC	Stefan Granolić Miloš Milaković	2	0					I Sabanov M Sabanov	6	6
		I Sabanov M Sabanov	6	6												I Sabanov M Sabanov	1	3
	3	J Ocleppo A Vavassori	4	3												A Martin H Podlipnik Castillo	6	6
		A Martin H Podlipnik Castillo	6	6					A Martin H Podlipnik Castillo	6	4
		P Cachin M Trungelliti	4	6					T Draganja A Giannessi	2	6
		T Draganja A Giannessi	6	7																			A Martin H Podlipnik Castillo	7	4
		C Berlocq D Marrero	6	6																			L Grigelis A Motti	5	6
	WC	Ivan Bjelica Darko Jandrić	3	4					C Berlocq D Marrero	6	7
		R Ojeda Lara O Roca Batalla	3	1				4	N Ćaćić T-S Weissborn	4	6
	4	N Ćaćić T-S Weissborn	6	6												C Berlocq D Marrero	6	6
	WC	Vanja Dobrnjac Ivan Randjelović	2	2												L Grigelis A Motti	7	7
		L Grigelis A Motti	6	6					L Grigelis A Motti	6	7
	Alt	D Kuzmanov JP Varillas	7	1				Alt	D Kuzmanov JP Varillas	0	5
	2	A Pavić A Šančić	5	6

References

• Main draw

• 2018 ATP Challenger Tour
• Banja Luka Challenger