Sao Paulo3 CH 1990
Jaime Oncins won the title, beating Francisco Yunis 6–3 6–3 in the final.
Main draw 32 players
- 1🇺🇾Marcelo FilippiniRound of 16 · Lost to Daniel Orsanic
- 2🇫🇷Jean Philippe FleurianRound of 16 · Lost to Joao Cunha Silva
- 4🇺🇸Malivai WashingtonQuarterfinals · Lost to Francisco Yunis
- 5🇧🇷Cassio MottaRound of 16 · Lost to Francisco Yunis
- 6🇦🇷Roberto AzarRound of 16 · Lost to Gabriel Markus
- 7🇨🇦Andrew SznajderQuarterfinals · Lost to Joao Cunha Silva
- 8🇧🇷Jaime OncinsFinal · Champion
- Q🇦🇷Francisco YunisFinal · Lost to Jaime Oncins
- Q🇦🇷Gabriel MarkusSemifinals · Lost to Jaime Oncins
- 🇵🇹Joao Cunha SilvaSemifinals · Lost to Francisco Yunis
- 🇦🇷Daniel OrsanicQuarterfinals · Lost to Jaime Oncins
- 🇦🇷Javier FranaQuarterfinals · Lost to Gabriel Markus
- 🇺🇸Francisco MontanaRound of 16 · Lost to Javier Frana
- Q🇨🇱Jose Antonio FernandezRound of 16 · Lost to Malivai Washington
- 🇨🇦Martin WostenholmeRound of 16 · Lost to Andrew Sznajder
- 🇦🇷Pablo AlbanoRound of 16 · Lost to Jaime Oncins
- Q🇧🇷Alexandre HocevarRound of 32 · Lost to Marcelo Filippini
- 🇳🇿Bruce DerlinRound of 32 · Lost to Martin Wostenholme
- WC🇧🇷Carlos De OliveiraRound of 32 · Lost to Gabriel Markus
- 🇧🇷Danilo MarcelinoRound of 32 · Lost to Francisco Yunis
- LL🇯🇵Eduardo FurushoRound of 32 · Lost to Francisco Montana
- LL🇧🇷Joao ZwetschRound of 32 · Lost to Joao Cunha Silva
- 🇧🇷Jose DaherRound of 32 · Lost to Javier Frana
- 🇦🇷Marcelo IngaramoRound of 32 · Lost to Andrew Sznajder
- 🇪🇸Marcos Aurelio GorrizRound of 32 · Lost to Jaime Oncins
- 🇨🇦Martin LaurendeauRound of 32 · Lost to Daniel Orsanic
- WC🇧🇷Nelson AertsRound of 32 · Lost to Malivai Washington
- 🇦🇷Roberto ArguelloRound of 32 · Lost to Jean Philippe Fleurian
- WC🇧🇷Roberto JabaliRound of 32 · Lost to Cassio Motta
- 🇺🇸Scott PatridgeRound of 32 · Lost to Pablo Albano
- 🇳🇿Steve GuyRound of 32 · Lost to Roberto Azar
- 🇺🇸Tim WilkisonRound of 32 · Lost to Jose Antonio Fernandez