| Singles | |
|---|---|
| 2004 BMW Open | |
| Champion |  Nikolay Davydenko |
| Runner-up |  Martin Verkerk |
| Final score | 6–4, 7–5 |
| Draw | 32 (4 Q / 3 WC ) |
| Seeds | 8 |
Roger Federer was the defending champion but did not compete that year.
Nikolay Davydenko won in the final 6–4, 7–5 against Martin Verkerk.
Rainer Schüttler (quarterfinals)
Paradorn Srichaphan (first round)
Jiří Novák (second round) Martin Verkerk (final)
Vince Spadea (second round)
Andrei Pavel (first round) Taylor Dent (second round) James Blake (first round)| Semifinals | Final | ||||||||||||
| Nikolay Davydenko | 6 | 6 | |||||||||||
 Luis Horna | 4 | 1 | |||||||||||
| Nikolay Davydenko | 6 | 7 | |||||||||||
| 4 | Martin Verkerk | 4 | 5 | ||||||||||
| 4 | Martin Verkerk | 77 | 6 | ||||||||||
 Olivier Rochus | 62 | 3 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | R Schüttler | 6 | 77 | ||||||||||||||||||||||||
 R Söderling | 4 | 65 | 1 | R Schüttler | 6 | 2 | 6 | ||||||||||||||||||||
| WC | T Haas | 6 | 6 | WC | T Haas | 4 | 6 | 4 | |||||||||||||||||||
| B Ulihrach | 3 | 2 | 1 | R Schüttler | 1 | 64 | |||||||||||||||||||||
| L Burgsmüller | 2 | 65 | N Davydenko | 6 | 77 | ||||||||||||||||||||||
| V Hănescu | 6 | 77 | V Hănescu | 78 | 2 | 4 | |||||||||||||||||||||
| N Davydenko | 77 | 6 | N Davydenko | 66 | 6 | 6 | |||||||||||||||||||||
| 6 | A Pavel | 63 | 4 | N Davydenko | 6 | 6 | |||||||||||||||||||||
| 3 | J Novák | 6 | 6 | L Horna | 4 | 1 | |||||||||||||||||||||
| M Youzhny | 4 | 2 | 3 | J Novák | 3 | 5 | |||||||||||||||||||||
 K Kučera | 3 | 5 | R Štěpánek | 6 | 7 | ||||||||||||||||||||||
| R Štěpánek | 6 | 7 | R Štěpánek | 66 | 62 | ||||||||||||||||||||||
| L Horna | 6 | 6 | L Horna | 78 | 77 | ||||||||||||||||||||||
 O Mutis | 4 | 1 | L Horna | 4 | 1 | ||||||||||||||||||||||
| A Dupuis | 65 | 62 | 7 | T Dent | 6 | 3r | |||||||||||||||||||||
| 7 | T Dent | 77 | 77 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | J Blake | 4 | 66 | ||||||||||||||||||||||||
 S Sargsian | 6 | 78 | S Sargsian | 2 | 4 | ||||||||||||||||||||||
| Q |  M Kratochvil | 6 | 4 | 6 | Q | M Kratochvil | 6 | 6 | |||||||||||||||||||
| X Malisse | 4 | 6 | 3 | Q | M Kratochvil | 3 | 60 | ||||||||||||||||||||
 W Moodie | 4 | 3 | 4 | M Verkerk | 6 | 77 | |||||||||||||||||||||
| Q |  B Pašanski | 6 | 6 | Q | B Pašanski | 63 | 64 | ||||||||||||||||||||
| J Johansson | 4 | 2 | 4 | M Verkerk | 77 | 77 | |||||||||||||||||||||
| 4 | M Verkerk | 6 | 6 | 4 | M Verkerk | 77 | 6 | ||||||||||||||||||||
| 5 | V Spadea | 6 | 6 | O Rochus | 62 | 3 | |||||||||||||||||||||
| Q | D Kindlmann | 4 | 2 | 5 | V Spadea | 6 | 5 | 64 | |||||||||||||||||||
| WC |  G Ivanišević | 4 | 60 | Q | A Waske | 3 | 7 | 77 | |||||||||||||||||||
| Q | A Waske | 6 | 77 | Q | A Waske | 6 | 3 | 4 | |||||||||||||||||||
 K Carlsen | 67 | 4 | O Rochus | 3 | 6 | 6 | |||||||||||||||||||||
| WC | P Kohlschreiber | 79 | 6 | WC | P Kohlschreiber | 64 | 2 | ||||||||||||||||||||
| O Rochus | 6 | 6 | O Rochus | 77 | 6 | ||||||||||||||||||||||
| 2 | P Srichaphan | 3 | 2 | ||||||||||||||||||||||||
The 2003 Canada Masters singles was the men's singles 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. Guillermo Cañas was the defending champion but did not compete that year. Andy Roddick won in the final 6–1, 6–3 against David Nalbandian.
Max Mirnyi was the defending champion but lost in the semifinals to Juan Carlos Ferrero.
Carlos Moyà was the defending champion but lost in the first round to Fabrice Santoro.
Andre Agassi was the defending champion but did not compete that year.
Marat Safin was the defending champion but did not compete that year.
Juan Carlos Ferrero was the defending champion but lost in the first round to Àlex Corretja.
Félix Mantilla was the defending champion but lost in the second round to Mariano Zabaleta.
Guillermo Coria was the defending champion but lost in the final to Roger Federer 4–6, 6–4, 6–2, 6–3.
Davide Sanguinetti was the defending champion but lost in the quarterfinals to Martin Verkerk.
Lars Burgsmüller was the defending champion but lost in the second round to Olivier Rochus.
Martin Damm and Cyril Suk were the defending champions but did not compete that year.
Sjeng Schalken was the defending champion and won in the final 6–3, 6–4 against Arnaud Clément.
Mark Philippoussis won in the final 6–2, 6–1 against Jiří Novák.
David Nalbandian was the defending champion but lost the final on a walkover against Guillermo Coria.
Bob Bryan and Mike Bryan were the defending champions but lost in the first round to James Blake and Martin Verkerk.
Hyung-Taik Lee was the defending champion but did not compete that year.
Martin Verkerk was the defending champion but lost in the quarterfinals to Grégory Carraz.
Roger Federer was the defending champion, and won in the final 6–0, 6–3, against Mardy Fish.
Martin Verkerk was the defending champion, but did not participate this year.
Nicolás Massú was the defending champion, but lost in the semifinals this year.