| Doubles | |
|---|---|
| 2003 Davidoff Swiss Indoors | |
| Champions |  Mark Knowles  Daniel Nestor |
| Runners-up |  Lucas Arnold Mariano Hood |
| Score | 6–4, 6–2 |
| Draw | 16 |
| Seeds | 4 |
Bob Bryan and Mike Bryan were the defending champions but lost in the first round to James Blake and Martin Verkerk.
Mark Knowles and Daniel Nestor won in the final 6–4, 6–2 against Lucas Arnold and Mariano Hood.
Champion 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) Mark Knowles / Daniel Nestor (champions)
Martin Damm / Cyril Suk (first round) Lucas Arnold / Mariano Hood (final)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | B Bryan M Bryan | 3 | 5 | ||||||||||||||||||||||||
J Blake  M Verkerk | 6 | 7 | J Blake M Verkerk | 4 | 6 | 5 | |||||||||||||||||||||
 D Prinosil T Zíb | 5 | 63 | S Humphries M Merklein | 6 | 2 | 7 | |||||||||||||||||||||
| S Humphries M Merklein | 7 | 77 | S Humphries M Merklein | 5 | 4 | ||||||||||||||||||||||
| 4 | L Arnold M Hood | 6 | 77 | 4 | L Arnold M Hood | 7 | 6 | ||||||||||||||||||||
 J Coetzee C Haggard | 3 | 64 | 4 | L Arnold M Hood | 6 | 6 | |||||||||||||||||||||
 Á López Morón F Mantilla | 6 | 6 | Á López Morón F Mantilla | 3 | 1 | ||||||||||||||||||||||
| WC |  G Bastl I Heuberger | 4 | 4 | 4 | Lucas Arnold Mariano Hood | 4 | 2 | ||||||||||||||||||||
| J Novák P Pála | 6 | 6 | 2 | Mark Knowles Daniel Nestor | 6 | 6 | |||||||||||||||||||||
| WC | M Chiudinelli S Wawrinka | 2 | 4 | J Novák P Pála | 6 | 6 | |||||||||||||||||||||
 T Perry J Thomas | 7 | 3 | 77 | T Perry J Thomas | 4 | 4 | |||||||||||||||||||||
| 3 | M Damm C Suk | 5 | 6 | 64 | J Novák P Pála | 4 | 1 | ||||||||||||||||||||
 I Ljubičić  F Volandri | 6 | 6 | 2 | M Knowles D Nestor | 6 | 6 | |||||||||||||||||||||
| R Nadal T Robredo | 4 | 3 | I Ljubičić F Volandri | 1 | 4 | ||||||||||||||||||||||
| Y Allegro M Rosset | 4 | 4 | 2 | M Knowles D Nestor | 6 | 6 | |||||||||||||||||||||
| 2 | M Knowles D Nestor | 6 | 6 | ||||||||||||||||||||||||
Xavier Malisse and Olivier Rochus were the defending champions, but lost in the third round against third seeds and eventual finalists Bob & Mike Bryan.
Jonas Björkman and Todd Woodbridge were the defending champions, but lost in the third round to Leander Paes and David Rikl.
Leander Paes and Martina Navratilova were the defending champions but lost in the third round to Wayne and Cara Black.
Bob and Mike Bryan were the defending champions, they lost to sixth-seeded Michaël Llodra and Fabrice Santoro in the semifinals.
The 2003 Canada Masters doubles was the men's doubles event of the one hundred and fourteenth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada. Bob Bryan and Mike Bryan were the defending champions but lost in the semifinals to Jonas Björkman and Todd Woodbridge. Mahesh Bhupathi and Max Mirnyi won in the final 6–3, 7–6(7–4) against Björkman and Woodbridge.
The 2002 Canada Masters doubles was the men's doubles event of the one hundred and thirteenth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada. Jiří Novák and David Rikl were the defending champions but they competed with different partners that year, Novák with Radek Štěpánek and Rikl with David Prinosil. Novak and Štěpánek lost in the second round to Mark Knowles and Daniel Nestor. Prinosil and Rikl lost in the semifinals to Bob Bryan and Mike Bryan. The Bryans won in the final 4–6, 7–6(7–1), 6–3 against Knowles and Nestor.
Michaël Llodra and Fabrice Santoro were the defending champions, and won the final 7–6(4), 6–3 against Bob and Mike Bryan.
Mark Knowles and Daniel Nestor won in the final 6–3, 7–5, 6–0 against Mahesh Bhupathi and Max Mirnyi.
Ellis Ferreira and Rick Leach were the defending champions but they competed with different partners that year, Ferreira with Pavel Vízner and Leach with Brian MacPhie.
Mahesh Bhupathi and Leander Paes were the defending champions but did not compete that year.
Martin Damm and Cyril Suk were the defending champions but lost in the semifinals to Michaël Llodra and Fabrice Santoro.
The 2003 Hamburg Masters doubles was a German tennis event.
Mark Knowles and Daniel Nestor were the defending champions but lost in the quarterfinals to Wayne Black and Kevin Ullyett.
Mark Knowles and Daniel Nestor were the defending champions but did not compete that year.
Wayne Ferreira and Yevgeny Kafelnikov were the defending champions but did not compete that year.
Mark Knowles and Daniel Nestor were the defending champions but lost in the semifinals to James Blake and Mardy Fish.
Mark Knowles and Daniel Nestor were the defending champions, but lost in the semifinals this year.
Mark Knowles and Daniel Nestor were the defending champions, but lost in the first round to Paul Goldstein and Jim Thomas.
Mahesh Bhupathi and Max Mirnyi were the defending champions, but lost in the quarterfinals to Michaël Llodra and Fabrice Santoro.
Bob Bryan and Mike Bryan were the defending champions but did not compete that year.