1999 RCA Championships – Singles

Àlex Corretja was the defending champion, but did not participate.

Nicolás Lapentti won the title, defeating Vince Spadea in the final 4–6, 6–4, 6–4.

Seeds
The top eight seeds received a bye into the second round. • # 🇺🇸 Pete Sampras (quarterfinals, retired due to a hip injury)

• # 🇦🇺 Patrick Rafter (quarterfinals, withdrew due to a shoulder injury)

• # 🇧🇷 Gustavo Kuerten (quarterfinals)

• # 🇪🇸 Carlos Moyá (quarterfinals)

• # 🇦🇺 Mark Philippoussis (second round)

• # Marcelo Ríos (third round)

• # 🇩🇪 Tommy Haas (second round)

• # 🇸🇪 Thomas Johansson (second round)

• # 🇪🇸 Félix Mantilla (first round)

• # 🇸🇪 Thomas Enqvist (second round)

• # 🇪🇨 Nicolás Lapentti (champion)

• # 🇪🇸 Albert Costa (second round)

• # 🇦🇷 Mariano Zabaleta (first round)

• # 🇫🇷 Cédric Pioline (third round)

• # 🇪🇸 Francisco Clavet (first round)

• # 🇧🇷 Fernando Meligeni (first round)