1978 South American Championships – Singles

Singles
1978 South American Championships
1977 Champion	Guillermo Vilas
Champion	José Luis Clerc
Runner-up	Víctor Pecci
Score	6–4, 6–4

Guillermo Vilas was the defending champion but did not compete that year.

José Luis Clerc won in the final 6–4, 6–4 against Víctor Pecci.

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

	First round							Second round							Quarterfinals							Semifinals							Final
	1	C Barazzutti	6	6
		B Prajoux	4	0				1	C Barazzutti	6	6
		P Cornejo	3	6	2				H Varela	4	4
		H Varela	6	1	6										1	C Barazzutti	6	6	6
		A Muñoz	4	6	1											C Kirmayr	4	7	3
		C Kirmayr	6	1	6				C Kirmayr	7	6
		R Gehring	6	2	6				R Gehring	6	3
	7	J Fillol	3	6	2																	1	C Barazzutti	4	4
	3	J Higueras	6	6																			V Pecci	6	6
		P McNamee	1	2				3	J Higueras	6	6
		I Molina	6	6	4				A Pattison	4	2
		A Pattison	4	7	6										3	J Higueras
		J L Damiani	2	6	6											V Pecci	w/o
		P Dominguez	6	2	1				J L Damiani	3	6	1
		V Pecci	6	6					V Pecci	6	1	6
	5	H Gildemeister	0	2																										Víctor Pecci	4	4
	6	P Bertolucci	6	6																									4	José Luis Clerc	6	6
		F Dalla Fontana	4	2				6	P Bertolucci	6	2	6
		A Maurer	6	5	6				R Ycaza	4	6	8
		R Ycaza	4	7	8											R Ycaza	3	3
		W Zirngibl	6	7											4	J L Clerc	6	6
		G Barbosa	3	5					W Zirngibl	1	1
		R Cano	1	2				4	J L Clerc	6	6
	4	J L Clerc	6	6																		4	J L Clerc	6	1	6
	8	C Lewis	6	6																		2	H Solomon	2	6	2
		G Hardie	2	2				8	C Lewis	5	6	6
		J Andrew	4	7	6				J Andrew	7	0	2
		L Álvarez	6	5	1										8	C Lewis	3	2
		J Soares	6	3	9										2	H Solomon	6	6
		P Kronk	2	6	7				J Soares	4	2
		V Winitsky	6	4	4			2	H Solomon	6	6
	2	H Solomon	2	6	6

• 1978 South American Championships Singles draw