Singles
2018 Challenger de Buenos Aires
Champion	Pablo Andújar
Runner-up	Pedro Cachin
Score	6–3, 6–1

Nicolás Kicker was the defending champion but was suspended from tennis due to match-fixing.

Pablo Andújar won the title after defeating Pedro Cachin 6–3, 6–1 in the final.

Seeds

Draw

Finals

	Semifinals							Final
		Dimitar Kuzmanov	3	66
		Pedro Cachin	6	78
									Pedro Cachin	3	1
								2	Pablo Andújar	6	6
	Q	Federico Coria	65	5
	2	Pablo Andújar	77	7

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	G Andreozzi	65	4
	Q	Bastián Malla	77	6				Q	B Malla	6	6
		D Gimeno Traver	78	5	6				D Gimeno Traver	2	4
		F Gaio	66	7	3										Q	B Malla	4	2
		D Kuzmanov	5	6	6											D Kuzmanov	6	6
	Alt	A Collarini	7	1	1				D Kuzmanov	6	6
		T Bellucci	4	6	3			7	G Quinzi	2	3
	7	G Quinzi	6	4	6																		D Kuzmanov	3	66
	3	T Monteiro	0	3																			P Cachin	6	78
		P Cachin	6	6					P Cachin	6	6
	Q	O Luz	6	3	6			Q	O Luz	2	1
	WC	F Cerúndolo	3	6	4											P Cachin	6	4	6
		F Argüello	6	6												F Argüello	1	6	4
	WC	R Olivo	1	2					F Argüello	6	6
	Q	G Villanueva	4	3				5	H Dellien	4	4
	5	H Dellien	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	F Bagnis	4	6	65
		M Cuevas	6	4	77				M Cuevas	4	1
		M Zekić	3	2					G Clezar	6	6
		G Clezar	6	6												G Clezar	65	5
	Q	F Coria	6	6											Q	F Coria	77	7
		D Dima	2	1				Q	F Coria	2	6	7
		J Domingues	4						J Domingues	6	3	5
	4	P Sousa	3r																			Q	F Coria	65	5
	6	C Berlocq	5	61																		2	P Andújar	77	7
		M Vilella Martínez	7	77					M Vilella Martínez	5r
	WC	JP Ficovich	6	3	64				P Krstin	5
		P Krstin	3	6	77											P Krstin	5	4
		A De Greef	6	6											2	P Andújar	7	6
		G Elias	4	3					A De Greef	1	2
	WC	F Mena	2	1				2	P Andújar	6	6
	2	P Andújar	6	6

References

• Main Draw
• Qualifying Draw