1991 Monte Carlo Open – Singles

Sergi Bruguera defeated Boris Becker in the final, 5–7, 6–4, 7–6(8–6), 7–6(7–4) to win the singles tennis title at the 1991 Monte Carlo Open.

Andrei Chesnokov was the defending champion, but lost to Boris Becker in the quarterfinals.

Seeds
The top eight seeds received a bye to the second round. • # 🇸🇪 Stefan Edberg (second round)

• # Boris Becker (final)

• # 🇫🇷 Guy Forget (third round)

• # 🇺🇸 Andre Agassi (second round)

• # Goran Ivanišević (third round)

• # 🇸🇪 Jonas Svensson (quarterfinals)

• # 🇪🇸 Emilio Sánchez (second round)

• # Andrei Chesnokov (quarterfinals)

• # 🇪🇸 Sergi Bruguera (champion)

• # Andrei Cherkasov (third round)

• # 🇦🇹 Thomas Muster (first round)

• # 🇪🇨 Andrés Gómez (first round)

• # Marc Rosset (first round)

• # Karel Nováček (first round)

• # 🇦🇷 Guillermo Pérez Roldán (second round)

• # Alexander Volkov (third round)