| Singles | |
|---|---|
| 1999 Heineken Open | |
| Champion |
|
| Runner-up |
|
| Final score | 6–4, 6–4 |
Sjeng Schalken defeated Tommy Haas 6–4, 6–4 to win the 1999 Heineken Open singles competition. Marcelo Ríos was the defending champion.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.