| Singles | |
|---|---|
| 2000 UBS Open Gstaad | |
| Champion |  Àlex Corretja |
| Runner-up |  Mariano Puerta |
| Score | 6–1, 6–3 |
Albert Costa was the defending champion, [1] but lost in the semifinals to Mariano Puerta.
Àlex Corretja won the title, defeating Puerta in the final 6–1, 6–3. [2]
A champion seed is indicated in bold while text in italics indicates the round in which that seed was eliminated.
Àlex Corretja (champion)
Nicolas Kiefer (second round) Juan Carlos Ferrero (first round) Albert Costa (semifinals)
Younes El Aynaoui (first round) Franco Squillari (quarterfinals, retired due to illness) [3] 
Marcelo Ríos (quarterfinals) Mariano Puerta (final)| Semifinals | Final | ||||||||||||
| 1 | Àlex Corretja | 7 | 7 | ||||||||||
| Gastón Gaudio | 5 | 5 | |||||||||||
| 1 | Àlex Corretja | 6 | 6 | ||||||||||
| 8 | Mariano Puerta | 1 | 3 | ||||||||||
| 4 | Albert Costa | 4 | 3 | ||||||||||
| 8 | Mariano Puerta | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | À Corretja | 6 | 4 | 6 | |||||||||||||||||||||||
 R Federer | 4 | 6 | 4 | 1 | À Corretja | 6 | 6 | ||||||||||||||||||||
| Q | S Bruguera | 6 | 5 | 2 |  V Spadea | 2 | 2 | ||||||||||||||||||||
| V Spadea | 2 | 7 | 6 | 1 | À Corretja | 66 | 6 | 6 | |||||||||||||||||||
| G Bastl | 6 | 6 | 7 | M Ríos | 78 | 1 | 3 | ||||||||||||||||||||
| Q | L Arnold Ker | 2 | 1 | G Bastl | 3 | 5 | |||||||||||||||||||||
 S Doseděl | 5 | 77 | 2 | 7 | M Ríos | 6 | 7 | ||||||||||||||||||||
| 7 | M Ríos | 7 | 62 | 6 | 1 | À Corretja | 7 | 7 | |||||||||||||||||||
| 3 | JC Ferrero | 4 | 63 | G Gaudio | 5 | 5 | |||||||||||||||||||||
| G Gaudio | 6 | 77 | G Gaudio | 6 | 4 | 7 | |||||||||||||||||||||
 M Mirnyi | 63 | 77 | 6 | M Mirnyi | 2 | 6 | 5 | ||||||||||||||||||||
| M Zabaleta | 77 | 63 | 3 | G Gaudio | 6 | 4 | |||||||||||||||||||||
| M Rosset | 6 | 6 | 6 | F Squillari | 1 | 1r | |||||||||||||||||||||
| WC | M Kratochvil | 3 | 2 | M Rosset | 3 | 5 | |||||||||||||||||||||
| R Schüttler | 5 | 5 | 6 | F Squillari | 6 | 7 | |||||||||||||||||||||
| 6 | F Squillari | 7 | 7 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | Y El Aynaoui | 1 | 6 | 4 | |||||||||||||||||||||||
| F Clavet | 6 | 4 | 6 | F Clavet | 3 | 5 | |||||||||||||||||||||
| H Arazi | 3 | 60 | J Novák | 6 | 7 | ||||||||||||||||||||||
| J Novák | 6 | 77 | J Novák | 3 | 1 | ||||||||||||||||||||||
| Q |  N Thomann | 6 | 2 | 4 | 4 | A Costa | 6 | 6 | |||||||||||||||||||
| J Golmard | 4 | 6 | 6 | J Golmard | 4 | 3 | |||||||||||||||||||||
 S Koubek | 6 | 3 | 3 | 4 | A Costa | 6 | 6 | ||||||||||||||||||||
| 4 | A Costa | 4 | 6 | 6 | 4 | A Costa | 4 | 3 | |||||||||||||||||||
| 8 | M Puerta | 6 | 6 | 8 | M Puerta | 6 | 6 | ||||||||||||||||||||
| A Di Pasquale | 3 | 4 | 8 | M Puerta | 6 | 6 | |||||||||||||||||||||
| F Vicente | 1 | 4 | F Mantilla | 0 | 2 | ||||||||||||||||||||||
| F Mantilla | 6 | 6 | 8 | M Puerta | 77 | 6 | |||||||||||||||||||||
| S Grosjean | 6 | 6 | S Grosjean | 64 | 3 | ||||||||||||||||||||||
| WC | I Heuberger | 3 | 4 | S Grosjean | 6 | 6 | |||||||||||||||||||||
| Q | Á Calatrava | 3 | 62 | 2 | N Kiefer | 3 | 1 | ||||||||||||||||||||
| 2 | N Kiefer | 6 | 77 | ||||||||||||||||||||||||
Albert Costa won the singles tennis title at the 1998 Hamburg European Open after Àlex Corretja retired from the final, with the scoreline at 6–2, 6–0, 1–0.
Richard Krajicek defeated Yevgeny Kafelnikov in the final, 6–4, 6–3, 6–3 to win the singles tennis title at the 1998 Eurocard Open.
Greg Rusedski defeated the defending champion Pete Sampras in the final, 6–4, 7–6(7–4), 6–3 to win the singles tennis title at the 1998 Paris Open.
Nicolas Escudé was the defending champion but lost in the quarterfinals against Sébastien Grosjean.
Àlex Corretja was the defending champion but lost in the second round to Christophe Rochus.
Àlex Corretja was the defending champion but lost in the second round to Stefan Koubek.
Pablo Albano and Cyril Suk were the defending champions but they competed with different partners that year, Albano with Lucas Arnold and Suk with Marius Barnard.
Olivier Rochus was the defending champion but did not compete that year.
Juan Carlos Ferrero was the defending champion but lost in the third round to Alberto Martín.
Nicolás Lapentti was the defending champion but lost in the third round to Mariano Zabaleta.
Tim Henman was the defending champion but lost in the quarterfinals to David Nalbandian.
Àlex Corretja was the defending champion but lost in the second round to Werner Eschauer.
Félix Mantilla was the defending champion but lost in the second round against Nicolás Lapentti. In the first round, wildcard entrant Sergi Bruguera defeated Roger Federer 6–1, 6–1. This is Federer's worst loss by number of games won in his entire career.
Gustavo Kuerten was the defending champion, but retired against Magnus Norman in the second round due to fatigue.
The 1999 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 1999 ATP Tour. It was the nineteenth edition of the tournament and was held from 23–29 August 1999.
Alberto Martín was the defending champion but lost in the quarterfinals to Markus Hantschk.
Àlex Corretja was the defending champion, but was forced to withdraw at his first round match against tournament runner-up Nicolás Lapentti.
Albert Costa was the 2-time defending champion, but lost in the third round to Francisco Clavet.
Mariano Puerta was the defending champion, but lost in the second round to Albert Costa.