| Singles | |
|---|---|
| 2015 Royal Lahaina Challenger | |
| Champion |  Jared Donaldson |
| Runner-up | Nicolas Meister |
| Score | 6–1, 6–4 |
Bradley Klahn was the defending champion, but lost in the semifinals to Jared Donaldson.
Donaldson went on to win the title, defeating Nicolas Meister 6–1, 6–4 in the final.
Denis Kudla (second round) Bradley Klahn (semifinals) Michael Russell (second round) Ryan Harrison (first round) Wayne Odesnik (second round)
Denys Molchanov (first round) Chase Buchanan (second round) Jarmere Jenkins (first round)| Semifinals | Final | ||||||||||||
| Q | Nicolas Meister | 77 | 6 | ||||||||||
 James McGee | 65 | 2 | |||||||||||
| Q | Nicolas Meister | 1 | 4 | ||||||||||
| Jared Donaldson | 6 | 6 | |||||||||||
| Jared Donaldson | 7 | 77 | |||||||||||
| 2 | Bradley Klahn | 5 | 64 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | D Kudla | 7 | 6 | ||||||||||||||||||||||||
 M Reid | 5 | 3 | 1 | D Kudla | 6 | 4 | 4 | ||||||||||||||||||||
| Q |  T Garanganga | 3 | 6 | 6 | Q | T Garanganga | 3 | 6 | 6 | ||||||||||||||||||
| Q |  C Wang | 6 | 3 | 2 | Q | T Garanganga | 3 | 77 | 2 | ||||||||||||||||||
| Q | N Meister | 6 | 6 | Q | N Meister | 6 | 63 | 6 | |||||||||||||||||||
| PR | R Sweeting | 3 | 0 | Q | N Meister | 77 | 6 | ||||||||||||||||||||
 T Niki | 6 | 62 | 6 | T Niki | 60 | 1 | |||||||||||||||||||||
| 6 | D Molchanov | 3 | 77 | 2 | Q | N Meister | 77 | 6 | |||||||||||||||||||
| 3 | M Russell | 2 | 6 | 6 | J McGee | 65 | 2 | ||||||||||||||||||||
| WC | M Krueger | 6 | 1 | 3 | 3 | M Russell | 62 | 3 | |||||||||||||||||||
| Q | S Bangoura | 4 | 2 | WC | S Kozlov | 77 | 6 | ||||||||||||||||||||
| WC | S Kozlov | 6 | 6 | WC | S Kozlov | 66 | 2 | ||||||||||||||||||||
| WC |  Marko Lenz | 3 | 3 | J McGee | 78 | 6 | |||||||||||||||||||||
| J McGee | 6 | 6 | J McGee | 6 | 6 | ||||||||||||||||||||||
 Henrique Cunha | 2 | 3 | 5 | W Odesnik | 4 | 4 | |||||||||||||||||||||
| 5 | W Odesnik | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | C Buchanan | 4 | 77 | 6 | |||||||||||||||||||||||
| D Nguyen | 6 | 64 | 3 | 7 | C Buchanan | 1 | 3 | ||||||||||||||||||||
| J Donaldson | 7 | 78 | J Donaldson | 6 | 6 | ||||||||||||||||||||||
| Y Uchiyama | 5 | 66 | J Donaldson | 6 | 77 | ||||||||||||||||||||||
 D Kutrovsky | 7 | 66 | 1 | D Novikov | 3 | 65 | |||||||||||||||||||||
 D King | 5 | 78 | 6 | D King | 4 | 3 | |||||||||||||||||||||
| D Novikov | 6 | 3 | 6 | D Novikov | 6 | 6 | |||||||||||||||||||||
| 4 | R Harrison | 4 | 6 | 3 | J Donaldson | 7 | 77 | ||||||||||||||||||||
| 8 | J Jenkins | 2 | 3 | 2 | B Klahn | 5 | 64 | ||||||||||||||||||||
 S Ehrat | 6 | 6 | S Ehrat | 1 | 6 | 6 | |||||||||||||||||||||
| R Williams | 6 | 6 | R Williams | 6 | 2 | 4 | |||||||||||||||||||||
| WC |  Thibaud Berland | 1 | 3 | S Ehrat | 5 | 4 | |||||||||||||||||||||
 F Nielsen | 2 | 6 | 6 | 2 | B Klahn | 7 | 6 | ||||||||||||||||||||
| J Jung | 6 | 4 | 1 | F Nielsen | 3 | 4 | |||||||||||||||||||||
| B Fratangelo | 5 | 1r | 2 | B Klahn | 6 | 6 | |||||||||||||||||||||
| 2 | B Klahn | 7 | 4 | ||||||||||||||||||||||||
Ričardas Berankis was the defending champion but, no longer competing in junior tennis, did not defend his title.
Juan Mónaco was the defending champion, but lost to John Isner in the semifinals.
Isner went on to win the title, defeating Nicolás Almagro in the final, 6–3, 7–5.
Michael Yani was the defending champion but decided not to participate. Alex Kuznetsov won the title defeating Bradley Klahn in the final.
Austin Krajicek and John Peers were the defending champions, but Peers chose not to compete.
Krajicek paired with Mitchell Krueger but lost in the semifinals to eventual finalists Bradley Klahn and Michael Venus.
Frank Dancevic and Peter Polansky won the title 7–5, 6–3.
This was the first edition of the event. Yuki Bhambri won, defeating runner-up Bradley Klahn.
David Ferrer was the three-time defending champion, but lost in the semifinals to Lu Yen-hsun.
Go Soeda was the two-time defending champion but chose not to compete.
Radek Štěpánek was the defending champion, but lost in the semifinals to Jiří Veselý.
Bradley Klahn and Michael Venus were the defending champions, but Venus chose to compete in the ATP World Tour. Bradley Klahn played alongside Jordan Thompson and they lost in the semifinals.
Yuki Bhambri was the defending champion, but he did not participate that year.
Bradley Klahn won the title, defeating Jarmere Jenkins in the final, 7–6(7–5), 6–1.
Yuki Bhambri was the Traralgon Champion from 2013, but he did not compete that year, while Bradley Klahn was current Traralgon Champion, having won the first of two challengers held in this place in 2014, but he lost to Benjamin Mitchell in the first round.
John Millman won the title, defeating James Ward in the final, 6–4, 6–1.
Alejandro Falla was the defending champion, but decided to compete in the 2015 Aircel Chennai Open instead.
Denis Shapovalov was the defending champion but chose not to defend his title.
Rafael Nadal defeated Stefanos Tsitsipas in the final, 6–2, 7–6(7–4) to win the men's singles tennis title at the 2018 Rogers Cup. It was his fourth Canadian Open title.
This was the first edition of the tournament.
Marin Čilić was the defending champion, but lost in the second round to Diego Schwartzman.
Evgeny Karlovskiy was the defending champion but lost in the first round to Stefan Kozlov.
Steve Johnson was the defending champion, but lost in the first round to Christopher Eubanks.
Defending champion Rafael Nadal defeated Daniil Medvedev in the final, 6–3, 6–0 to win the men's singles tennis title at the 2019 Canadian Open. It was the first time Nadal successfully defended a hard court title.
Bernard Tomic was the defending champion, but retired in the first round of the qualifying tournament against Denis Istomin.