Singles
2018 Milex Open
Champion	Christian Garín
Runner-up	Federico Delbonis
Score	6–4, 5–7, 6–4

Víctor Estrella Burgos was the defending champion but lost in the first round to Federico Delbonis.

Christian Garín won the title after defeating Delbonis 6–4, 5–7, 6–4 in the final.

Seeds

Draw

Finals

	Semifinals							Final
		Carlos Berlocq	7	64	1
		Christian Garín	5	77	6
									Christian Garín	6	5	6
								2	Federico Delbonis	4	7	4
		Peđa Krstin	0	3
	2	Federico Delbonis	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	P Cuevas	65	6	3
	PR	S Giraldo	77	2	6			PR	S Giraldo	64	62
		C Berlocq	6	6					C Berlocq	77	77
	Q	A Gómez	4	3												C Berlocq	6	4	6
	WC	J Olivares	2	0											WC	J Hernández-Fernández	1	6	2
	Q	F Coria	6	6				Q	F Coria	5	0
	WC	J Hernández-Fernández	7	1	7			WC	J Hernández-Fernández	7	6
	6	T Monteiro	5	6	5																		C Berlocq	7	64	1
	3	G Andreozzi	62	6	6																		C Garín	5	77	6
	Q	M Cuevas	77	2	3			3	G Andreozzi	62	4
		N Serdarušić	77	6					N Serdarušić	77	6
	Alt	T Bellucci	65	4												N Serdarušić	2	2
		S Ofner	2	0												C Garín	6	6
		C Garín	6	6					C Garín	6	6
		R Quiroz	1	3				7	JI Londero	3	1
	7	JI Londero	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	F Bagnis	4	2
	WC	E Gómez	6	6				WC	E Gómez	3	1
		P Krstin	6	6					P Krstin	6	6
		R Cid Subervi	0	1												P Krstin	6	3
		M Arévalo	3	67											PR	J Melzer	1	2r
		G Elias	6	79					G Elias	77	63	61
	PR	J Melzer	7	6				PR	J Melzer	60	77	77
	4	H Dellien	5	3																			P Krstin	0	3
	5	P Lorenzi	3	6	6																	2	F Delbonis	6	6
	Q	JP Varillas	6	1	0			5	P Lorenzi	79	77
		G Melzer	6	2					G Melzer	67	63
	Alt	P Cachin	2	0r											5	P Lorenzi	5	5
		M Vilella Martínez	1	3											2	F Delbonis	7	7
		R Dutra Silva	6	6					R Dutra Silva	4	1
	WC	V Estrella Burgos	5	3				2	F Delbonis	6	6
	2	F Delbonis	7	6

References

• Main Draw
• Qualifying Draw