1984 Player's Canadian Open – Men's singles

Ivan Lendl was the defending champion, but lost in the second round this year.

John McEnroe successfully defended his title, defeating Vitas Gerulaitis 6–0, 6–3 in the final.

Seeds

 * 1)  Ivan Lendl (second round)
 * 2) 🇺🇸 John McEnroe (champion)
 * 3) 🇺🇸 Jimmy Connors (semifinals)
 * 4) 🇺🇸 Jimmy Arias (quarterfinals)
 * 5) 🇺🇸 Johan Kriek (second round)
 * 6) 🇸🇪 Anders Järryd (third round)
 * 7) 🇺🇸 Eliot Teltscher (quarterfinals)
 * 8) 🇺🇸 Vitas Gerulaitis (final)
 * 9) 🇦🇺 Pat Cash (third round)
 * 10) 🇸🇪 Joakim Nyström (second round)
 * 11) 🇺🇸 Tim Mayotte (first round)
 * 12) 🇺🇸 Bill Scanlon (third round)
 * 13)  Kevin Curren (semifinals)
 * 14) 🇫🇷 Henri Leconte (third round)
 * 15)  Heinz Günthardt (first round)
 * 16) 🇺🇸 Peter Fleming (quarterfinals)