1991 Canadian Open – Men's singles

Andrei Chesnokov defeated Petr Korda in the final, 3–6, 6–4, 6–3 to win the men's singles tennis title at the 1991 Canadian Open.

Michael Chang was the defending champion, but lost in the second round to Stefano Pescosolido.

Seeds
• # Ivan Lendl (semifinals)

• # 🇺🇸 Jim Courier (semifinals)

• # 🇺🇸 Andre Agassi (second round)

• # 🇺🇸 Pete Sampras (second round)

• # 🇺🇸 Michael Chang (second round)

• # Jakob Hlasek (quarterfinals)

• # 🇺🇸 John McEnroe (third round)

• # 🇺🇸 Brad Gilbert (third round)

• # 🇺🇸 Richey Reneberg (second round)

• # 🇺🇸 Derrick Rostagno (quarterfinals)

• # 🇮🇹 Cristiano Caratti (first round)

• # Andrei Chesnokov (champion)

• # 🇺🇸 Patrick McEnroe (third round)

• # 🇵🇪 Jaime Yzaga (first round)

• # 🇦🇺 Wally Masur (third round)

• # 🇮🇱 Amos Mansdorf (third round)