| Doubles | |
|---|---|
| 2003 Delray Beach International Tennis Championships | |
| Champions |  Leander Paes  Nenad Zimonjić |
| Runners-up |  Raemon Sluiter Martin Verkerk |
| Score | 7–5, 3–6, 7–5 |
Martin Damm and Cyril Suk were the defending champions but did not compete that year.
Leander Paes and Nenad Zimonjić won in the final 7–5, 3–6, 7–5 against Raemon Sluiter and Martin Verkerk.
Mahesh Bhupathi / 
Joshua Eagle (first round)
David Adams / Robbie Koenig (first round)
Jan-Michael Gambill / Graydon Oliver (semifinals)
František Čermák / Leoš Friedl (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | M Bhupathi J Eagle | 3 | 64 | ||||||||||||||||||||||||
 S Aspelin N Healey | 6 | 77 | S Aspelin N Healey | 77 | 3 | 4 | |||||||||||||||||||||
| WC | P Goldstein R Kendrick | 79 | 77 | WC | P Goldstein R Kendrick | 64 | 6 | 6 | |||||||||||||||||||
 A Schneiter J Tarango | 67 | 63 | WC | P Goldstein R Kendrick | 4 | 6 | 64 | ||||||||||||||||||||
| 4 | F Čermák L Friedl | 7 | 61 | 2 | R Sluiter M Verkerk | 6 | 3 | 77 | |||||||||||||||||||
| A Roddick B Vahaly | 5 | 77 | 6 | A Roddick B Vahaly | |||||||||||||||||||||||
 H-T Lee  V Voltchkov | 6 | 1r | R Sluiter M Verkerk | w/o | |||||||||||||||||||||||
| R Sluiter M Verkerk | 4 | 1 | R Sluiter M Verkerk | 5 | 6 | 5 | |||||||||||||||||||||
| M Hood A Kratzmann | 2 | 4 | L Paes N Zimonjić | 7 | 3 | 7 | |||||||||||||||||||||
L Lobo  M Ríos | 6 | 6 | L Lobo M Ríos | 69 | 2 | ||||||||||||||||||||||
 J-R Lisnard  M Llodra | 6 | 1 | 1 | 3 | J-M Gambill G Oliver | 711 | 6 | ||||||||||||||||||||
| 3 | J-M Gambill G Oliver | 3 | 6 | 6 | 3 | J-M Gambill G Oliver | 3 | 6 | 3 | ||||||||||||||||||
D Bowen  A Martín | 62 | 60 | L Paes N Zimonjić | 6 | 3 | 6 | |||||||||||||||||||||
| WC | L Jensen M Jensen | 77 | 77 | WC | L Jensen M Jensen | ||||||||||||||||||||||
| L Paes N Zimonjić | 6 | 64 | 6 | L Paes N Zimonjić | w/o | ||||||||||||||||||||||
| 2 | D Adams R Koenig | 2 | 77 | 1 | |||||||||||||||||||||||
Andre Agassi defeated Todd Martin in the final, 6–4, 6–7(5–7), 6–7(2–7), 6–3, 6–2 to win the men's singles tennis title at the 1999 US Open. With the win, he returned to the world No. 1 singles ranking, and helped end Pete Sampras' streak of six year-end No. 1 rankings.
Bob Bryan and Mike Bryan were the defending champions, but chose to compete at the Beijing Summer Olympics instead.
Roger Federer was the defending champion but did not compete that year.
Igor Kunitsyn was the defending champion, but lost to Evgeny Korolev in the first round.
Mikhail Youzhny won in the final 6–7(5–7), 6–0, 6–4 against Janko Tipsarević.
Daniel Nestor and Sandon Stolle were the defending champions but only Stolle competed that year with Joshua Eagle.
Joshua Eagle and Sandon Stolle were the defending champions but did not compete that year.
Martin Verkerk was the defending champion but lost in the quarterfinals to Grégory Carraz.
Mariano Hood and Sebastián Prieto were the defending champions but they competed with different partners that year, Hood with Lucas Arnold and Prieto with Martín García.
Wayne Ferreira and Yevgeny Kafelnikov were the defending champions but did not compete that year.
Lucas Arnold and Mariano Hood were the defending champions but only Hood competed that year with Sebastián Prieto.
Patrick McEnroe was the defending champion but lost in the second round to Richard Fromberg.
Thomas Enqvist was the defending champion but lost in the quarterfinals to Todd Martin.
Michael Chang was the defending champion but lost in the second round to Martin Damm.
Thomas Enqvist was the defending champion and won in the final 7–5, 6–4, 7–6(7–0) against Todd Martin.
Roger Federer was the defending champion, but was forced to withdraw from the tournament before the semifinals because of a back injury. Following Federer's withdrawal, Stefan Edberg and Jo-Wilfried Tsonga played a one set exhibition match to make up the evening session.
Nicolás Massú was the defending champion, but lost in the semifinals this year.
Marc Rosset was the defending champion, but lost in the first round this year.
Martin Damm and Andrei Olhovskiy were the defending champions, but Olhovskiy did not participate this year. Damm partnered Jiří Novák, losing in the first round.
Martin Damm and Henrik Holm were the defending champions, but did not play together this year. Damm partnered Karel Nováček, losing in the first round. Holm partnered Anders Järryd, losing in the first round.
Karol Kučera was the defending champion but lost to Àlex Corretja in the semifinals.