| Doubles | |
|---|---|
| 1998 Waldbaum's Hamlet Cup | |
| Champions |  Julián Alonso Javier Sánchez [1] |
| Runners-up |  Brandon Coupe Dave Randall |
| Score | 6–4, 6–4 |
The 1998 Waldbaum's Hamlet Cup was a men's tennis tournament played on Hard courts in Long Island, United 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.
David Adams / 
Brett Steven (semifinals) Julián Alonso / Javier Sánchez (champions) Robbie Koenig / 
David Prinosil (first round)
Aleksandar Kitinov / 
David Roditi (first round)| First round | Quarterfinals | Semifinals | Final [1] | ||||||||||||||||||||||||
| 1 | D Adams B Steven | 7 | 6 | ||||||||||||||||||||||||
 S Groen M Oosting | 6 | 4 | 1 | D Adams B Steven | 6 | 6 | |||||||||||||||||||||
D Bowen  T Anzari | 7 | 4 | 6 | D Bowen T Anzari | 3 | 0 | |||||||||||||||||||||
 D del Río  J Holmes | 6 | 6 | 3 | 1 | D Adams B Steven | 4 | 4 | ||||||||||||||||||||
| B Coupe D Randall | 7 | 6 | B Coupe D Randall | 6 | 6 | ||||||||||||||||||||||
| 4 | A Kitinov D Roditi | 6 | 4 | B Coupe D Randall | 6 | 6 | 6 | ||||||||||||||||||||
| S Noteboom F Wibier | 6 | 6 | S Noteboom F Wibier | 4 | 7 | 4 | |||||||||||||||||||||
| A Berasategui À Corretja | 2 | 1 | B Coupe D Randall | 4 | 4 | ||||||||||||||||||||||
| E Taino G Van Emburgh | 6 | 7 | 2 | J Alonso J Sánchez | 6 | 6 | |||||||||||||||||||||
JA Conde  N Djordjevic | 3 | 6 | E Taino G Van Emburgh | 6 | 3 | 6 | |||||||||||||||||||||
| L Jensen M Jensen | 2 | 6 | 7 | L Jensen M Jensen | 4 | 6 | 7 | ||||||||||||||||||||
| 3 | R Koenig D Prinosil | 6 | 4 | 6 | L Jensen M Jensen | 4 | 4 | ||||||||||||||||||||
 F Meligeni M Puerta | 6 | 6 | 2 | J Alonso J Sánchez | 6 | 6 | |||||||||||||||||||||
| J Hausman T Meringoff | 2 | 4 | F Meligeni M Puerta | 6 | 5 | 3 | |||||||||||||||||||||
| 2 | J Alonso J Sánchez | 6 | 7 | 2 | J Alonso J Sánchez | 3 | 7 | 6 | |||||||||||||||||||
| G Silcock M Wakefield | 4 | 5 | |||||||||||||||||||||||||
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