| Men's singles | |
|---|---|
| 2015 Challenger Banque Nationale de Granby | |
| Champion |  Vincent Millot |
| Runner-up |  Philip Bester |
| Final score | 6–4, 6–4 |
Hiroki Moriya was the defending champion, but decided not to participate this year.
Vincent Millot won the title, defeating Philip Bester 6–4, 6–4 in the final.
Benjamin Becker (first round)
Lukáš Lacko (first round)
Go Soeda (second round) Yoshihito Nishioka (semifinals)
John-Patrick Smith (withdrew)
Maxime Authom (first round, retired)
Matteo Donati (semifinals)
Darian King (second round)| Semifinals | Final | ||||||||||||
| Vincent Millot | 6 | 6 | |||||||||||
| 7 | Matteo Donati | 4 | 1 | ||||||||||
| Vincent Millot | 6 | 6 | |||||||||||
| Philip Bester | 4 | 4 | |||||||||||
| 4 | Yoshihito Nishioka | 65 | 6 | 3 | |||||||||
| Philip Bester | 77 | 3 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | B Becker | 2 | 67 | ||||||||||||||||||||||||
| P Polansky | 6 | 79 | P Polansky | 3 | 6 | 5 | |||||||||||||||||||||
| F Peliwo | 62 | 4 |  E Quigley | 6 | 0 | 7 | |||||||||||||||||||||
| E Quigley | 77 | 6 | E Quigley | 77 | 4 | 3 | |||||||||||||||||||||
| E Couacaud | 6 | 3 | 2 | V Millot | 64 | 6 | 6 | ||||||||||||||||||||
| PR | Dennis Nevolo | 4 | 6 | 6 | PR | D Nevolo | 3 | 5 | |||||||||||||||||||
| WC | Isade Juneau | 2 | 2 | V Millot | 6 | 7 | |||||||||||||||||||||
| V Millot | 6 | 6 | V Millot | 6 | 6 | ||||||||||||||||||||||
| 3 | G Soeda | 1 | 6 | 6 | 7 | M Donati | 4 | 1 | |||||||||||||||||||
| Hiroyasu Ehara | 6 | 3 | 0 | 3 | G Soeda | 2 | 2 | ||||||||||||||||||||
| Q | N Kryvonos | 5 | 1 | Y Uchiyama | 6 | 6 | |||||||||||||||||||||
| Y Uchiyama | 7 | 6 | Y Uchiyama | 3 | 2 | ||||||||||||||||||||||
| Shuichi Sekiguchi | 3 | 6 | 6 | 7 | M Donati | 6 | 6 | ||||||||||||||||||||
| F Dancevic | 6 | 3 | 4 | S Sekiguchi | 4 | 1 | |||||||||||||||||||||
| A El Mihdawy | 2 | 3 | 7 | M Donati | 6 | 6 | |||||||||||||||||||||
| 7 | M Donati | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | D King | 6 | 6 | ||||||||||||||||||||||||
| Q | R Sarmiento | 2 | 3 | 8 | D King | 5 | 3 | ||||||||||||||||||||
| Q | A Whittington | 3 | 2 | Q | F Auger-Aliassime | 7 | 6 | ||||||||||||||||||||
| Q | F Auger-Aliassime | 6 | 6 | Q | F Auger-Aliassime | 6 | 2 | 1 | |||||||||||||||||||
 A Bossel | 4 | 0 | 4 | Y Nishioka | 4 | 6 | 6 | ||||||||||||||||||||
| L Saville | 6 | 6 | L Saville | 3 | 2 | ||||||||||||||||||||||
| WC | B Schnur | 3 | 710 | 2 | 4 | Y Nishioka | 6 | 6 | |||||||||||||||||||
| 4 | Y Nishioka | 6 | 68 | 6 | 4 | Y Nishioka | 65 | 6 | 3 | ||||||||||||||||||
| 6 | M Authom | 6 | 65 | 0r | P Bester | 77 | 3 | 6 | |||||||||||||||||||
| Erik Crepaldi | 4 | 77 | 3 | E Crepaldi | 3 | 77 | 3 | ||||||||||||||||||||
| LL | Jean-Yves Aubone | 6 | 6 | LL | J-Y Aubone | 6 | 65 | 6 | |||||||||||||||||||
| WC | Pavel Krainik | 4 | 2 | LL | J-Y Aubone | 5 | 4 | ||||||||||||||||||||
| WC | D Shapovalov | 6 | 4 | 4 | P Bester | 7 | 6 | ||||||||||||||||||||
| A Bolt | 3 | 6 | 6 | A Bolt | 4 | 3 | |||||||||||||||||||||
| P Bester | 77 | 6 | P Bester | 6 | 6 | ||||||||||||||||||||||
| 2 | L Lacko | 65 | 4 | ||||||||||||||||||||||||
Jim Courier defeated Andre Agassi in the final, 3–6, 6–4, 2–6, 6–1, 6–4 to win the men's singles tennis title at the 1991 French Open.
Two-time defending champion Rafael Nadal successfully defended his title, defeating Roger Federer in a rematch of the previous year's final 6–4, 6–4, to win the singles title at the 2007 Monte Carlo Masters.
Serena Williams was the defending champion, but was forced to withdraw due to a left knee injury.
Andre Agassi was the defending champion, but retired from his semifinals match this year.
Andrey Golubev was the defending champion, but lost to Philipp Kohlschreiber in the first round.
There was no defending champion, due to the cancellation of the semifinals in 1998 due to rain.
Jonas Björkman was the defending champion, but lost in the second round this year.
Agnieszka Radwańska was the defending champion, but lost 6–0, 6–3 in the semifinals to the eventual champion Serena Williams.
Tomáš Berdych was the defending champion, but chose not to compete.
Grigor Dimitrov won the title, defeating David Ferrer in the final, 2–6, 6–3, 6–4.
Tim Henman was the defending champion but chose to participate in the 2004 Summer Olympics.
David Ferrer was the two-time defending champion and successfully defended his title by beating Fabio Fognini in the final 6–4, 6–3.
Ana Ivanovic was the defending champion, but lost to Caroline Garcia in the semifinals.
Roger Federer was the two-time defending champion and successfully defended his title, defeating Andreas Seppi in the final, 7–6(7–1), 6–4.
Samantha Stosur was the defending champion, but chose not to participate.
David Ferrer was the defending champion, but lost in the quarterfinals to Dominic Thiem.
Elina Svitolina was the defending champion and successfully defended her title, beating Daria Kasatkina in the final, 6–4, 6–0.
Pablo Cuevas was the three-time defending champion, but lost in the semifinals to Fabio Fognini.
Irina-Camelia Begu was the defending champion, but lost to Ons Jabeur in the first round.
David Goffin was the defending champion, but lost in the second round to Andy Murray.
Juan Martín del Potro was the two-time defending champion but chose not to defend his title.