1985 Player's Canadian Open – Men's singles

John McEnroe was the defending champion.

McEnroe successfully defended his title, defeating Ivan Lendl 7–5, 6–3 in the final.

Seeds

 * 1) 🇺🇸 John McEnroe (champion)
 * 2)  Ivan Lendl (final)
 * 3) 🇺🇸 Jimmy Connors (semifinals)
 * 4) 🇺🇸 Kevin Curren (third round)
 * 5) 🇸🇪 Anders Järryd (quarterfinals)
 * 6) 🇸🇪 Stefan Edberg (quarterfinals)
 * 7) 🇺🇸 Eliot Teltscher (quarterfinals)
 * 8) 🇺🇸 Johan Kriek (third round)
 * 9) 🇺🇸 Tim Mayotte (third round)
 * 10) 🇺🇸 Scott Davis (first round)
 * 11) 🇸🇪 Henrik Sundström (third round)
 * 12)  Tomáš Šmíd (first round)
 * 13) 🇺🇸 Vitas Gerulaitis (third round)
 * 14) 🇺🇸 Sammy Giammalva Jr. (third round)
 * 15) 🇺🇸 Jimmy Arias (semifinals)
 * 16) 🇮🇳 Ramesh Krishnan (quarterfinals)