Mark Woodforde was the defending champion but lost in the first round to Jimmy Arias.
Thomas Muster won in the final 3–6, 6–2, 7–5 against Arias.
Seeds
Sergi Bruguera (semifinals) Goran Ivanišević (first round) Thomas Muster (champion) Alexander Volkov (second round) Paul Annacone (second round) Mark Koevermans (quarterfinals) Michiel Schapers (second round) Marc Rosset (second round)
Draw
Finals
Top half
Bottom half
External links 1990 Australian Men's Hardcourt Championships draw