Wayne Black and Kevin Ullyett were the defending champions but only Black competed that year with Mark Philippoussis.
| Doubles | |
|---|---|
| 2003 Siebel Open | |
| Champions |  Hyung-Taik Lee  Vladimir Voltchkov |
| Runners-up |  Paul Goldstein Robert Kendrick |
| Score | 7–5, 4–6, 6–3 |
| Draw | 16 |
| Seeds | 4 |
Black and Philippoussis lost in the quarterfinals to Davide Sanguinetti and Jim Thomas.
Hyung-Taik Lee and Vladimir Voltchkov won in the final 7–5, 4–6, 6–3 against Paul Goldstein and Robert Kendrick.
Seeds
editChampion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.
Bob Bryan / Mike Bryan (first round)
Chris Haggard / Brian MacPhie (first round)- Jan-Michael Gambill / Graydon Oliver (semifinals)
Mark Merklein / 
Thomas Shimada (first round)
Draw
editKey
edit- 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
- NG = Next Gen Accelerator Program entrant
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | B Bryan M Bryan
| 7 | 3 | 5 | |||||||||||||||||||||||
| H-T Lee V Voltchkov
| 5 | 6 | 7 | H-T Lee V Voltchkov
| 6 | 6 | |||||||||||||||||||||
| WC |  P Amritraj S Amritraj
| 6 | 6 | WC | P Amritraj S Amritraj
| 2 | 4 | ||||||||||||||||||||
 J Balcells K Carlsen
| 1 | 4 | H-T Lee V Voltchkov
| 6 | 77 | ||||||||||||||||||||||
| 3 | J-M Gambill G Oliver
| 6 | 6 | 3 | J-M Gambill G Oliver
| 4 | 61 | ||||||||||||||||||||
| J Gimelstob S Humphries
| 3 | 4 | 3 | J-M Gambill G Oliver
| 6 | 77 | |||||||||||||||||||||
 N Davydenko K Pless
| 5 | 1 | r |  J-L de Jager M Wakefield
| 3 | 64 | |||||||||||||||||||||
| J-L de Jager M Wakefield
| 7 | 2 | Hyung-Taik Lee Vladimir Voltchkov
| 7 | 4 | 6 | |||||||||||||||||||||
| J Blake T Martin
| 3 | 3 | WC | Paul Goldstein Robert Kendrick
| 5 | 6 | 3 | ||||||||||||||||||||
 D Sanguinetti J Thomas
| 6 | 6 | D Sanguinetti J Thomas
| 79 | 6 | ||||||||||||||||||||||
 W Black M Philippoussis
| 4 | 6 | 6 | W Black M Philippoussis
| 67 | 4 | |||||||||||||||||||||
| 4 |  M Merklein T Shimada
| 6 | 3 | 4 | D Sanguinetti J Thomas
| 3 | 4 | ||||||||||||||||||||
| M Fish J Morrison
| 6 | 3 | 3 | WC | P Goldstein R Kendrick
| 6 | 6 | ||||||||||||||||||||
| WC | P Goldstein R Kendrick
| 4 | 6 | 6 | WC | P Goldstein R Kendrick
| 6 | 4 | 6 | ||||||||||||||||||
| R Ginepri B Vahaly
| 2 | 6 | 6 | R Ginepri B Vahaly
| 4 | 6 | 2 | ||||||||||||||||||||
| 2 | C Haggard B MacPhie
| 6 | 4 | 4 | |||||||||||||||||||||||