# 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.
* Marcelo Ríos (first round)
* Félix Mantilla (semifinals)
* Wayne Ferreira (first round)
* Byron Black (first round)
* Tommy Haas (final)
* Fabrice Santoro (first round)
* Vincent Spadea (first round)
* Dominik Hrbatý (quarterfinals)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking
| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | M Ríos | 7 | 0 | R | | | | | | | | | | | | | | | | | | | |
| | A Pavel | 5 | 2 | | | A Pavel | 6 | 6 | | | | | | | | | | | | | | | |
| | F Vicente | 6 | 4 | 6 | | F Vicente | 3 | 4 | | | | | | | | | | | | | | | |
| | J Tarango | 2 | 6 | 4 | | | | | | | A Pavel | 3 | 2 | | | | | | | | | | |
| Q | G Cañas | 6 | 5 | 3 | | | | | | | S Schalken | 6 | 6 | | | | | | | | | | |
| | D Vacek | 4 | 7 | 6 | | D Vacek | 4 | 4 | | | | | | | | | | | | | | | |
| | S Schalken | 7$^8$ | 6 | | | S Schalken | 6 | 6 | | | | | | | | | | | | | | | |
| 7 | V Spadea | 6$^6$ | 4 | | | | | | | | | | | | | S Schalken | 6 | 6 | | | | | |
| 3 | W Ferreira | 1 | 4 | | | | | | | | | | | | WC | B Steven | 4 | 4 | | | | | |
| WC | B Steven | 6 | 6 | | WC | B Steven | 7 | 6 | | | | | | | | | | | | | | | |
| | M Safin | 6 | 6 | | | M Safin | 5 | 2 | | | | | | | | | | | | | | | |
| | G Pozzi | 3 | 2 | | | | | | | WC | B Steven | 6 | 6 | | | | | | | | | | |
| | M Zabaleta | 3 | 6 | 6 | | | | | | | M Zabaleta | 0 | 4 | | | | | | | | | | |
| | D Sanguinetti | 6 | 3 | 2 | | M Zabaleta | 5 | 6 | 6 | | | | | | | | | | | | | | |
| | M Norman | 4 | 7$^9$ | 3 | | M Norman | 7 | 3 | 3 | | | | | | | | | | | | | | |
| 6 | F Santoro | 6 | 6$^7$ | 0/R | | | | | | | | | | | | | | | | | Sjeng Schalken | 6 | 6 |
| 5 | T Haas | 6 | 7$^7$ | | | | | | | | | | | | | | | | | 5 | Tommy Haas | 4 | 4 |
| Q | A Sá | 2 | 6$^5$ | | 5 | T Haas | 6 | 6 | | | | | | | | | | | | | | | |
| | J Marín | 6 | 6 | | | J Marín | 3 | 4 | | | | | | | | | | | | | | | |
| | C Costa | 3 | 4 | | | | | | | 5 | T Haas | 7$^7$ | 7$^7$ | | | | | | | | | | |
| Q | A Martín | 6 | 6 | | | | | | | | G Raoux | 6$^4$ | 6$^2$ | | | | | | | | | | |
| | A Ilie | 3 | 4 | | Q | A Martín | 6$^5$ | 7 | 6$^1$ | | | | | | | | | | | | | | |
| | G Raoux | 6 | 6 | | | G Raoux | 7$^7$ | 5 | 7$^7$ | | | | | | | | | | | | | | |
| 4 | B Black | 3 | 3 | | | | | | | | | | | | 5 | T Haas | 4 | 6 | 6 | | | | |
| 8 | D Hrbatý | 6 | 6 | | | | | | | | | | | | 2 | F Mantilla | 6 | 3 | 3 | | | | |
| | F Squillari | 2 | 4 | | 8 | D Hrbatý | 7$^7$ | 7 | | | | | | | | | | | | | | | |
| | F Meligeni | 6 | 7 | | | F Meligeni | 6$^2$ | 5 | | | | | | | | | | | | | | | |
| WC | A Hunt | 1 | 5 | | | | | | | 8 | D Hrbatý | 6 | 5 | 3 | | | | | | | | | |
| | A Voinea | 7$^7$ | 6 | | | | | | | 2 | F Mantilla | 2 | 7 | 6 | | | | | | | | | |
| WC | J Courier | 6$^5$ | 1 | | | A Voinea | 6 | 1 | 4 | | | | | | | | | | | | | | |
| Q | L Tieleman | 6$^{10}$ | 2 | | 2 | F Mantilla | 1 | 6 | 6 | | | | | | | | | | | | | | |
| 2 | F Mantilla | 7$^{12}$ | 6 | | | | | | | | | | | | | | | | | | | | |