Men's singles
2018 Open Castilla y León
Champion	Ugo Humbert
Runner-up	Adrián Menéndez Maceiras
Score	6–3, 6–4

Jaume Munar was the defending champion but chose not to defend his title.

Ugo Humbert won the title after defeating Adrián Menéndez Maceiras 6–3, 6–4 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	7	Ugo Humbert	77	6
	3	Luca Vanni	65	4
								7	Ugo Humbert	6	6
								2	Adrián Menéndez Maceiras	3	4
	4	Andrea Arnaboldi	66	65
	2	Adrián Menéndez Maceiras	78	77

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	S Stakhovsky	3	6	65
		M Viola	6	2	77				M Viola	5	5
		R Quiroz	4	6	6				R Quiroz	7	7
		Carlos Boluda-Purkiss	6	4	4											R Quiroz	2	7	67
		Christopher Heyman	4	4											7	U Humbert	6	5	79
		João Monteiro	6	6					J Monteiro	1	3
		R Ortega Olmedo	6	3	2			7	U Humbert	6	6
	7	U Humbert	4	6	6																	7	U Humbert	77	6
	3	L Vanni	6	4	6																	3	L Vanni	65	4
	WC	A Davidovich Fokina	1	6	4			3	L Vanni	6	3	6
		C Gómez-Herrera	66	63					F Baldi	4	6	4
		F Baldi	78	77											3	L Vanni	6	6
		GM Moroni	6	6												GM Moroni	1	4
		D Guez	3	2					GM Moroni	6	61	6
		I Nedelko	6	6					I Nedelko	4	77	3
	Q	K-M Maamoun	3	4

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	D Brands	6	6
	Q	A Romero de Ávila Senise	4	2				6	D Brands	6	6
	Q	HN Lý	6	6				Q	HN Lý	2	4
	LL	S Doumbia	2	1											6	D Brands	6	3	65
		T Brkić	5	3											4	A Arnaboldi	4	6	77
		A Šetkić	7	6					A Šetkić	3	3
	WC	Miguel Semmler	6	5	5			4	A Arnaboldi	6	6
	4	A Arnaboldi	4	7	7																	4	A Arnaboldi	66	65
	5	S Griekspoor	6	1	63																	2	A Menéndez Maceiras	78	77
	WC	A Artuñedo	3	6	77			WC	A Artuñedo	6	5
		M Neuchrist	6	77					M Neuchrist	1	2r
		A Pavić	3	64											WC	A Artuñedo	63	66
		C İlkel	6	6											2	A Menéndez Maceiras	77	78
	WC	Jorge Hernando Ruano	4	3					C İlkel	0	2
	Q	Y Jankovits	4	2				2	A Menéndez Maceiras	6	6
	2	A Menéndez Maceiras	6	6

References

• Main draw
• Qualifying draw