Singles
2018 Tilia Slovenia Open
Champion	Constant Lestienne
Runner-up	Andrea Arnaboldi
Score	6–2, 6–1

Sergiy Stakhovsky was the defending champion but lost in the quarterfinals to Constant Lestienne.

Lestienne won the title after defeating Andrea Arnaboldi 6–2, 6–1 in the final.

Seeds

Draw

Finals

	Semifinals							Final
		Constant Lestienne	6	6
		Dominik Köpfer	3	2
									Constant Lestienne	6	6
								8	Andrea Arnaboldi	2	1
	3	Adrián Menéndez Maceiras	64	5
	8	Andrea Arnaboldi	77	7

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	S Stakhovsky	4	6	6
	LL	Christopher Heyman	6	3	3			1	S Stakhovsky	77	6
	Q	A Çelikbilek	6	6				Q	A Çelikbilek	62	2
	WC	Aljaž Jakob Kaplja	0	1											1	S Stakhovsky	6	2	1
		C Lestienne	6	6												C Lestienne	3	6	6
		F Gaio	3	2					C Lestienne	6	6
		V Šafránek	65	2				7	N Serdarušić	4	2
	7	N Serdarušić	77	6																			C Lestienne	6	6
	4	G Quinzi	3	77	5																		D Köpfer	3	2
		GM Moroni	6	63	7				GM Moroni	6	6
		L Rosol	3	5					C İlkel	1	1
		C İlkel	6	7												GM Moroni	4	6	1
	WC	N Razboršek	77	5	64											D Köpfer	6	3	6
		D Köpfer	63	7	77				D Köpfer	4	6	7
		F Baldi	77	3	4			6	L Vanni	6	1	5
	6	L Vanni	65	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	S Caruso	6	6
	Q	A Karatsev	3	3				5	S Caruso	4	6	7
	Q	M Eriksson	6	66	6			Q	M Eriksson	6	3	5
		V Galović	4	78	4										5	S Caruso	2	5
		L Miedler	6	6											3	A Menéndez Maceiras	6	7
	Q	F Nielsen	3	2					L Miedler	6	3	3
		I Nedelko	2r					3	A Menéndez Maceiras	4	6	6
	3	A Menéndez Maceiras	4																			3	A Menéndez Maceiras	64	5
	8	A Arnaboldi	6	77																		8	A Arnaboldi	77	7
	WC	T Kočevar-Dešman	0	62				8	A Arnaboldi	6	1	6
		T Kamke	6	6					T Kamke	2	6	4
	WC	A Radinski	0	2											8	A Arnaboldi	6	6
	SE	P Kotov	6	6												A Šetkić	2	4
		B Bonzi	4	3				SE	P Kotov	3	1
		A Šetkić	6	6					A Šetkić	6	6
	2	D Novak	4	2

References

• Main draw
• Qualifying draw