1991 Norstar Bank Hamlet Challenge Cup – Singles

The singles event of the 1991 Norstar Bank Hamlet Challenge Cup consisted of 32 players including eight seeded players. First-seeded Stefan Edberg was the defending champion, but second-seeded Ivan Lendl defeated him 6–3, 6–2, in the final. It was Lendl's 13th and last win against Edberg, taking their head-to-head to 13–10.

Seeds

 * 1) 🇸🇪 Stefan Edberg (final)
 * 2)  Ivan Lendl (champion)
 * 3) 🇺🇸 David Wheaton (first round)
 * 4) 🇺🇸 John McEnroe (semifinals)
 * 5)  Goran Ivanišević (first round)
 * 6) 🇸🇪 Jonas Svensson (first round)
 * 7) 🇦🇷 Alberto Mancini (first round)
 * 8) 🇮🇹 Omar Camporese (quarterfinals)