1984 NSW Building Society Open – Men's singles

Joakim Nyström was the defending champion, but did not compete this year.

John Fitzgerald won the title by defeating Sammy Giammalva Jr. 6–3, 6–3 in the final.

Seeds
The first eight seeds received a bye into the second round. • # 🇺🇸 Johan Kriek (semifinals)

• # 🇺🇸 Tim Mayotte (second round)

• # Kevin Curren (semifinals)

• # 🇬🇧 John Lloyd (second round)

• # 🇺🇸 Mike Bauer (second round)

• # 🇺🇸 Ben Testerman (quarterfinals)

• # Miloslav Mečíř (second round)

• # 🇫🇷 Guy Forget (second round)

• # 🇦🇺 John Fitzgerald (champion)

• # 🇺🇸 Bill Scanlon (quarterfinals)

• # 🇺🇸 Marty Davis (quarterfinals)

• # 🇺🇸 Leif Shiras (second round)

• # 🇺🇸 Scott Davis (third round)

• # 🇦🇺 Wally Masur (third round)

• # 🇺🇸 Tom Gullikson (quarterfinals)

• # 🇦🇺 Brad Drewett (third round)