Men's singles
1971 South American Open
Champion	Željko Franulović
Runner-up	Ilie Năstase
Score	6–3, 7–6, 6–1

Željko Franulović defeated Ilie Năstase 6–3, 7–6, 6–1 to win the 1971 South American Open singles competition. Franulović was the defending champion.

Draw

Final

	Final
		Ilie Năstase	3	6	1
		Željko Franulović	6	7	6

Section 1

	First round									Second round									Quarterfinals									Semifinals
		I Năstase	6	6	6
		O Escribano	2	4	4						I Năstase	3	7	6	6
		M Holeček	6	7	6						M Holeček	6	6	3	0
		P Cornejo	3	5	3															I Năstase	6	6	6
		T Gorman	6	6	6															I Gulyás	3	3	4
		R Graetz	3	3	1						T Gorman	6	2	0	2
		I Gulyás	6	6	6						I Gulyás	2	6	6	6
		E Zuleta	1	0	3																								I Năstase	6	7	6
		C Graebner	6	6	6																								J Leschly	1	5	3
		N Herrero	2	1	3						C Graebner	1	3	6	1
		J Leschly	2	6	4	6	6				J Leschly	6	6	1	6
		T Vázquez	6	4	6	3	3													J Leschly	6	4	6	6
		C Richey	6	6	6															C Richey	1	6	3	2
		R Cano	0	2	4						C Richey	3	6	4	7	6
		G Vilas									G Vilas	6	4	6	6	2

Section 2

	First round									Second round									Quarterfinals									Semifinals
		Z Franulović	6	6	6	6
		G Romani	7	3	2	4					Z Franulović	6	6	6
		J Ganzábal	6	6	6						J Ganzábal	2	4	1
		E Soriano	4	2	2															Z Franulović	6	7	7	6
		F Froehling	7	6	6															F Froehling	7	6	6	4
		L Álvarez	6	4	2						F Froehling	7	7	7
		J Pinto Bravo	6	6	6						J Pinto Bravo	6	5	5
		T Koch	1	4	3																								Z Franulović	2	7	6	6
		R Aubone	6	7	6																								S Smith	6	6	1	3
		J Fillol Sr.	2	6	4						R Aubone	4	0	7	6	7
		M Lynch									M Lynch	6	6	5	3	5
																				R Aubone	2	4	4
		J Loyo-Mayo	7	6	6															S Smith	6	6	6
		P Rodríguez	5	2	3						J Loyo-Mayo	1	2	6	3
		R Aubone	2	0	1						S Smith	6	6	2	6
		S Smith	6	6	6

External links

• 1971 ATP Buenos Aires Singles draw