1999 Heineken Open – Singles

Sjeng Schalken defeated Tommy Haas 6–4, 6–4 to win the 1999 Heineken Open singles competition. Marcelo Ríos was the defending champion.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.


 * 1)  Marcelo Ríos (first round)
 * 2) 🇪🇸 Félix Mantilla (semifinals)
 * 3)  Wayne Ferreira (first round)
 * 4)  Byron Black (first round)
 * 5) 🇩🇪 Tommy Haas (final)
 * 6) 🇫🇷 Fabrice Santoro (first round)
 * 7) 🇺🇸 Vincent Spadea (first round)
 * 8) 🇸🇰 Dominik Hrbatý (quarterfinals)