| Singles | |
|---|---|
| 1998 Waldbaum's Hamlet Cup | |
| 1997 Champion |  Carlos Moyá |
| Champion |  Patrick Rafter [1] |
| Runner-up | Felix Mantilla |
| Score | 7–6(7–3), 6–2 |
| Draw | 32 |
| Seeds | 8 |
The 1998 Waldbaum's Hamlet Cup was a men's tennis tournament played on Hard courts in Long Island, United States that was part of the International Series of the 1998 ATP Tour. It was the eighteenth edition of the tournament and was held from 24 to 30 August 1998.
Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.
Marcelo Ríos (first round) Patrick Rafter (champion) Carlos Moyá (second round)
Greg Rusedski (semifinals) Alberto Berasategui (first round)
Goran Ivanišević (first round) Felix Mantilla (final)
Jan Siemerink (second round)| Semifinals | Final [1] | ||||||||||||
| 8 | Felix Mantilla | 6 | 5 | 6 | |||||||||
 Marat Safin | 3 | 7 | 4 | ||||||||||
| 8 | Felix Mantilla | 63 | 2 | ||||||||||
| 2 | Patrick Rafter | 7 | 6 | ||||||||||
| 4 | Greg Rusedski | 4 | 5 | ||||||||||
| 2 | Patrick Rafter | 6 | 7 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
 G Kuerten | 6 | 7 | |||||||||||||||||||||||||
| 1 | M Ríos | 3 | 64 | G Kuerten | 2 | 6 | 7 | ||||||||||||||||||||
| F Clavet | 6 | 6 | F Clavet | 6 | 3 | 68 | |||||||||||||||||||||
 L Mor | 2 | 1 | G Kuerten | 4 | 6 | 6 | |||||||||||||||||||||
 B Ulihrach | 6 | 7 | 8 | F Mantilla | 6 | 2 | 4 | ||||||||||||||||||||
| C Doseděl | 4 | 65 | B Ulihrach | 64 | 3 | ||||||||||||||||||||||
| 8 | F Mantilla | 6 | 6 | 8 | F Mantilla | 7 | 6 | ||||||||||||||||||||
| S Bruguera | 4 | 4 | 8 | F Mantilla | 6 | 5 | 6 | ||||||||||||||||||||
| 3 | C Moyá | 7 | 6 | M Safin | 3 | 7 | 4 | ||||||||||||||||||||
 B Steven | 5 | 3 | 3 | C Moyá | 2 | 2 | |||||||||||||||||||||
 D Prinosil | 0 | 6 | 6 | D Prinosil | 6 | 6 | |||||||||||||||||||||
 D Hrbatý | 6 | 3 | 1 | D Prinosil | 1 | 62 | |||||||||||||||||||||
 F Dewulf | 6 | 7 | M Safin | 6 | 7 | ||||||||||||||||||||||
| M Woodforde | 4 | 66 | F Dewulf | 66 | 1 | ||||||||||||||||||||||
| M Safin | 6 | 6 | M Safin | 7 | 6 | ||||||||||||||||||||||
| 6 | A Berasategui | 3 | 2 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 9 | J Siemerink | 4 | 6 | 6 | |||||||||||||||||||||||
| J Alonso | 6 | 1 | 4 | 9 | J Siemerink | 1 | 6 | 3 | |||||||||||||||||||
| D Vacek | 6 | 6 | D Vacek | 6 | 4 | 6 | |||||||||||||||||||||
 M Rosset | 1 | 4 | D Vacek | 2 | 3 | ||||||||||||||||||||||
| F Meligeni | 62 | 6 | 6 | 4 | G Rusedski | 6 | 6 | ||||||||||||||||||||
 G Raoux | 7 | 4 | 3 | F Meligeni | 2 | 66 | |||||||||||||||||||||
| 4 | G Rusedski | 6 | 6 | 4 | G Rusedski | 6 | 7 | ||||||||||||||||||||
 M Norman | 3 | 4 | 4 | G Rusedski | 4 | 5 | |||||||||||||||||||||
 H Arazi | 5 | 6 | 7 | 2 | P Rafter | 6 | 7 | ||||||||||||||||||||
| 7 | G Ivanišević | 7 | 3 | 62 | H Arazi | 3 | 6 | 3 | |||||||||||||||||||
| N Escudé | 6 | 6 | N Escudé | 6 | 3 | 6 | |||||||||||||||||||||
| T Johansson | 1 | 4 | N Escudé | 3 | 2 | ||||||||||||||||||||||
| M Damm | 3 | 6 | 6 | 2 | P Rafter | 6 | 6 | ||||||||||||||||||||
| J Burillo | 6 | 2 | 3 | M Damm | 4 | 3 | |||||||||||||||||||||
| 2 | P Rafter | 6 | 4 | 6 | 2 | P Rafter | 6 | 6 | |||||||||||||||||||
| J Sánchez | 2 | 6 | 4 | ||||||||||||||||||||||||
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