1999 Internazionali di Tennis di San Marino – Singles

Dominik Hrbatý was the defending champion, but was forced to withdraw in his first round match against Marcelo Filippini due to a muscle strain.

Galo Blanco won the title by defeating Albert Portas 4–6, 6–4, 6–3 in the final.

Seeds
• # 🇸🇰 Dominik Hrbatý (first round, retired)

• # 🇦🇷 Mariano Zabaleta (first round)

• # 🇧🇷 Fernando Meligeni (first round)

• # 🇲🇦 Younes El Aynaoui (second round, retired)

• # 🇪🇸 Fernando Vicente (first round)

• # 🇲🇦 Hicham Arazi (first round)

• # 🇦🇹 Stefan Koubek (quarterfinals)

• # 🇦🇷 Franco Squillari (second round)