| Men's doubles | |
|---|---|
| 2003 Adidas International | |
| Champions |  Paul Hanley Nathan Healey |
| Runners-up |  Mahesh Bhupathi Joshua Eagle |
| Score | 7–6(7–3), 6–4 |
Donald Johnson and Jared Palmer were the defending champions but did not compete that year.
Paul Hanley and Nathan Healey won in the final 7–6(7–3), 6–4 against Mahesh Bhupathi and Joshua Eagle.
Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.
Mark Knowles / 
Daniel Nestor (semifinals)
Bob Bryan / Mike Bryan (semifinals) Mahesh Bhupathi / Joshua Eagle (final)
Martin Damm / Cyril Suk (quarterfinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | M Knowles D Nestor | 64 | 6 | 6 | |||||||||||||||||||||||
 M Mirnyi V Voltchkov | 77 | 3 | 3 | 1 | M Knowles D Nestor | 6 | 6 | ||||||||||||||||||||
 T Shimada  P Srichaphan | 2 | T Shimada P Srichaphan | 1 | 4 | |||||||||||||||||||||||
 M Safin  N Zimonjić | 1 | r | 1 | M Knowles D Nestor | 68 | 5 | |||||||||||||||||||||
| 4 | M Damm C Suk | 6 | 6 | WC | P Hanley N Healey | 710 | 7 | ||||||||||||||||||||
 S Aspelin M Hill | 3 | 2 | 4 | M Damm C Suk | 6 | 4 | 3 | ||||||||||||||||||||
| L Paes D Rikl | 6 | 3 | 1 | WC | P Hanley N Healey | 4 | 6 | 6 | |||||||||||||||||||
| WC | P Hanley N Healey | 2 | 6 | 6 | WC | Paul Hanley Nathan Healey | 77 | 6 | |||||||||||||||||||
| WC | A Florent S Stolle | 3 | 4 | 3 | Mahesh Bhupathi Joshua Eagle | 63 | 4 | ||||||||||||||||||||
A Kratzmann  K Ullyett | 6 | 6 | A Kratzmann K Ullyett | 2 | 6 | 66 | |||||||||||||||||||||
 J C Ferrero T Robredo | 63 | 2 | 3 | M Bhupathi J Eagle | 6 | 3 | 78 | ||||||||||||||||||||
| 3 | M Bhupathi J Eagle | 77 | 6 | 3 | M Bhupathi J Eagle | 6 | 6 | ||||||||||||||||||||
 J Boutter M Llodra | 1 | r | 2 | B Bryan M Bryan | 3 | 2 | |||||||||||||||||||||
 K Braasch R Schüttler | 2 | K Braasch R Schüttler | 64 | 3 | |||||||||||||||||||||||
 G Gaudio  N Lapentti | 6 | 3 | 2 | 2 | B Bryan M Bryan | 77 | 6 | ||||||||||||||||||||
| 2 | B Bryan M Bryan | 4 | 6 | 6 | |||||||||||||||||||||||
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.
Ellis Ferreira and Rick Leach were the defending champions but they competed with different partners that year, Ferreira with Grant Stafford and Leach with David Macpherson.
Leander Paes and Jan Siemerink were the defending champions but they competed with different partners that year, Paes with Mahesh Bhupathi and Siemerink with Jack Waite.
Donald Johnson and Jared Palmer were the defending champions but lost in the second round to Guillermo Cañas and David Nalbandian.
Wayne Ferreira and Yevgeny Kafelnikov were the defending champions but lost in the second round to Wayne Black and Kevin Ullyett.
Jonas Björkman and Todd Woodbridge were the defending champions but lost in the final 6–2, 6–4 against Mahesh Bhupathi and Jan-Michael Gambill.
Nicklas Kulti and Max Mirnyi were the defending champions but only Mirnyi competed that year with Sandon Stolle.
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.
Mike Bryan and Mark Knowles were the defending champions but only Bryan competed that year with his brother Bob.
Mahesh Bhupathi and Mike Bryan were the defending champions but did not compete that year.
Rennae Stubbs and Jared Palmer were the defending champions but only Stubbs competed that year with Todd Woodbridge.
Mahesh Bhupathi and Max Mirnyi were the defending champions, but lost in the quarterfinals to Michaël Llodra and Fabrice Santoro.
Luis Lobo and Javier Sánchez were the defending champions, but lost in the second round to Tomás Carbonell and Francisco Roig.
Mark Knowles and Daniel Nestor were the defending champions, but Nestor chose not to participate this year. Knowles team up with Jim Grabb, but lost in the first round to Jonas Björkman and Pat Rafter.
The 2001 US Open was held between August 27 – September 9, 2001. It was the final Grand Slam event of 2001.