2003 AIG Japan Open Tennis Championships – Men's doubles
2003 tennis tournament held in Japan
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Jeff Coetzee and Chris Haggard were the defending champions but lost in the first round to Jiří Novák and Petr Pála.
Champions
Justin Gimelstob
Nicolas Kiefer
Justin Gimelstob 
Nicolas KieferRunners-up Scott Humphries
Mark Merklein
Scott Humphries 
Mark MerkleinScore6–7(6–8), 6–3, 7–6(7–4)
Draw16 (2WC)
| Men's doubles | |
|---|---|
| 2003 AIG Japan Open Tennis Championships | |
| Champions | Justin Gimelstob Nicolas Kiefer |
| Runners-up | Scott Humphries Mark Merklein |
| Score | 6–7(6–8), 6–3, 7–6(7–4) |
| Draw | 16 (2WC) |
| Seeds | 4 |
Justin Gimelstob and Nicolas Kiefer won in the final 6–7(6–8), 6–3, 7–6(7–4) against Scott Humphries and Mark Merklein.
Seeds
Wayne Arthurs / Paul Hanley (first round)
Jeff Coetzee / Chris Haggard (first round)- Rick Leach / Brian MacPhie (quarterfinals)
Jonathan Erlich / Andy Ram (first round)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 |  W Arthurs P Hanley
| 4 | 4 | ||||||||||||||||||||||||
| WC |  S Iwabuchi J Kato
| 6 | 6 | WC | S Iwabuchi J Kato
| 6 | 6 | ||||||||||||||||||||
| J-M Gambill B Vahaly
| 63 | 65 |  Y Allegro P Luxa
| 2 | 2 | ||||||||||||||||||||||
| Y Allegro P Luxa
| 77 | 77 | WC | S Iwabuchi J Kato
| 3 | 4 | |||||||||||||||||||||
| 4 |  J Erlich A Ram
| 1 | 6 | 611 | J Gimelstob N Kiefer
| 6 | 6 | ||||||||||||||||||||
| T Perry J Thomas
| 6 | 4 | 713 | T Perry J Thomas
| 4 | 3 | |||||||||||||||||||||
| J Gimelstob N Kiefer
| 6 | 7 | J Gimelstob N Kiefer
| 6 | 6 | ||||||||||||||||||||||
A Kratzmann J van Lottum
| 2 | 5 | J Gimelstob N Kiefer
| 66 | 6 | 77 | |||||||||||||||||||||
| L Burgsmüller R Schüttler
| 3 | 4 | S Humphries M Merklein
| 78 | 3 | 64 | |||||||||||||||||||||
| S Humphries M Merklein
| 6 | 6 | S Humphries M Merklein
| 6 | 77 | ||||||||||||||||||||||
J Kerr M Wakefield
| 4 | 6 | 3 | 3 | R Leach B MacPhie
| 3 | 63 | ||||||||||||||||||||
| 3 | R Leach B MacPhie
| 6 | 3 | 6 | S Humphries M Merklein
| 2 | 6 | 6 | |||||||||||||||||||
 M García G Oliver
| 6 | 5 | 77 | J Novák P Pála
| 6 | 2 | 3 | ||||||||||||||||||||
| WC | T Shimada T Suzuki
| 4 | 7 | 63 | M García G Oliver
| 4 | 1 | ||||||||||||||||||||
| J Novák P Pála
| 6 | 7 | J Novák P Pála
| 6 | 6 | ||||||||||||||||||||||
| 2 | J Coetzee C Haggard
| 2 | 5 | ||||||||||||||||||||||||