1991 Stockholm Open – Singles

Defending champion Boris Becker defeated Stefan Edberg in a rematch of the previous year's final, 3–6, 6–4, 1–6, 6–2, 6–2 to win the singles tennis title at the 1991 Stockholm Open.

Seeds
• # 🇸🇪 Stefan Edberg (final)

• # 🇩🇪 Boris Becker (champion)

• # 🇺🇸 Jim Courier (semifinals)

• # 🇩🇪 Michael Stich (second round)

• # Ivan Lendl (third round)

• # 🇫🇷 Guy Forget (third round)

• # 🇺🇸 Pete Sampras (quarterfinals)

• # 🇪🇸 Sergi Bruguera (second round)

• # Karel Nováček (third round)

• # 🇺🇸 David Wheaton (second round)

• # Petr Korda (quarterfinals)

• # Goran Ivanišević (quarterfinals, retired)

• # 🇺🇸 Derrick Rostagno (third round)

• # Jakob Hlasek (third round)

• # Goran Prpić (third round)

• # 🇺🇸 Brad Gilbert (third round)