| Singles | |
|---|---|
| 2019 Nielsen Pro Tennis Championship | |
| Champion |  Bradley Klahn |
| Runner-up |  Jason Kubler |
| Score | 6–2, 7–5 |
Evgeny Karlovskiy was the defending champion [1] but lost in the first round to Stefan Kozlov.
Bradley Klahn won the title after defeating Jason Kubler 6–2, 7–5 in the final.
All seeds receive a bye into the second round.
Bradley Klahn (champion) Matthew Ebden (second round, retired)
Guido Andreozzi (third round, retired)
Denis Istomin (semifinals)
Jason Jung (quarterfinals) Bjorn Fratangelo (quarterfinals)
Adrián Menéndez Maceiras (second round, retired)
Ramkumar Ramanathan (quarterfinals) Michael Mmoh (second round)
Quentin Halys (second round) Mitchell Krueger (second round) Jason Kubler (final) Thanasi Kokkinakis (semifinals, withdrew) Christopher Eubanks (quarterfinals) Donald Young (third round) Thai-Son Kwiatkowski (second round)| Quarterfinals | Semifinals | Final | ||||||||||||||||||
| 1 | Bradley Klahn | 6 | 77 | |||||||||||||||||
| 6/WC | Bjorn Fratangelo | 4 | 63 | |||||||||||||||||
| 1 | Bradley Klahn | 6 | 6 | |||||||||||||||||
| 4/WC | Denis Istomin | 2 | 3 | |||||||||||||||||
| 4/WC | Denis Istomin | 6 | 7 | |||||||||||||||||
| 8 | Ramkumar Ramanathan | 2 | 5 | |||||||||||||||||
| 1 | Bradley Klahn | 6 | 7 | |||||||||||||||||
| 12 | Jason Kubler | 2 | 5 | |||||||||||||||||
| 5 | Jason Jung | 64 | 1 | |||||||||||||||||
| 13 | Thanasi Kokkinakis | 77 | 6 | |||||||||||||||||
| 13 | Thanasi Kokkinakis | |||||||||||||||||||
| 12 | Jason Kubler | w/o | ||||||||||||||||||
| 12 | Jason Kubler | 6 | 6 | |||||||||||||||||
| 14 | Christopher Eubanks | 4 | 3 | |||||||||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 1 | B Klahn | 7 | 6 | ||||||||||||||||||||||||
| WC | A Rybakov | 63 | 3 | M Purcell | 5 | 3 | |||||||||||||||||||||
| M Purcell | 77 | 6 | 1 | B Klahn | 6 | 6 | |||||||||||||||||||||
| ITF | S Bangoura | 7 | 6 | 15 | D Young | 1 | 3 | ||||||||||||||||||||
| R Shane | 5 | 3 | ITF | S Bangoura | 3 | 4 | |||||||||||||||||||||
| 15 | D Young | 6 | 6 | ||||||||||||||||||||||||
| 1 | B Klahn | 6 | 77 | ||||||||||||||||||||||||
| 6/WC | B Fratangelo | 4 | 63 | ||||||||||||||||||||||||
| 9 | M Mmoh | 4 | 4 | ||||||||||||||||||||||||
| R Sarmiento | 77 | 4 | 0 | R Smith | 6 | 6 | |||||||||||||||||||||
| Roy Smith | 63 | 6 | 6 | R Smith | 3 | 3 | |||||||||||||||||||||
| U Blanch | 6 | 77 | 6/WC | B Fratangelo | 6 | 6 | |||||||||||||||||||||
| WC | Stefan Dostanic | 2 | 64 | U Blanch | 62 | 6 | 0r | ||||||||||||||||||||
| 6/WC | B Fratangelo | 77 | 4 | 2 | |||||||||||||||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 4/WC | D Istomin | 6 | 3 | 6 | |||||||||||||||||||||||
| A Sarkissian | 2 | 2 | ITF |  A Dougaz | 3 | 6 | 3 | ||||||||||||||||||||
| ITF | A Dougaz | 6 | 6 | 4/WC | D Istomin | 6 | 6 | ||||||||||||||||||||
| C Altamirano | 6 | 4 | 6 | C Altamirano | 3 | 0 | |||||||||||||||||||||
| ITF | Ma Redlicki | 2 | 6 | 4 | C Altamirano | 6 | 6 | ||||||||||||||||||||
| 16 | T-S Kwiatkowski | 3 | 0 | ||||||||||||||||||||||||
| 4/WC | D Istomin | 6 | 7 | ||||||||||||||||||||||||
| 8 | R Ramanathan | 2 | 5 | ||||||||||||||||||||||||
| 11 | M Krueger | 6 | 62 | 63 | |||||||||||||||||||||||
 T Gabashvili | 3 | 0 | JC Aragone | 2 | 77 | 77 | |||||||||||||||||||||
| JC Aragone | 6 | 6 | JC Aragone | 66 | 3 | ||||||||||||||||||||||
| Mi Redlicki | 7 | 6 | 8 | R Ramanathan | 78 | 6 | |||||||||||||||||||||
| E King | 5 | 4 | Mi Redlicki | 5 | 5 | ||||||||||||||||||||||
| 8 | R Ramanathan | 7 | 7 | ||||||||||||||||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 5 | J Jung | 6 | 6 | ||||||||||||||||||||||||
| ITF | Jordi Arconada | 3 | 4 | PR |  M Neuchrist | 2 | 2 | ||||||||||||||||||||
| PR | M Neuchrist | 6 | 6 | 5 | J Jung | 6 | 6 | ||||||||||||||||||||
| Q | Felix Corwin | 1 | 3 | ITF |  M Pervolarakis | 2 | 4 | ||||||||||||||||||||
| ITF | M Pervolarakis | 6 | 6 | ITF | M Pervolarakis | 77 | 78 | ||||||||||||||||||||
| 10 | Q Halys | 63 | 66 | ||||||||||||||||||||||||
| 5 | J Jung | 64 | 1 | ||||||||||||||||||||||||
| 13 | T Kokkinakis | 77 | 6 | ||||||||||||||||||||||||
| 13 | T Kokkinakis | 6 | 6 | ||||||||||||||||||||||||
| K King | 3 | 3 |  A González | 4 | 3 | ||||||||||||||||||||||
| A González | 6 | 6 | 13 | T Kokkinakis | 77 | 4 | |||||||||||||||||||||
| Q | J McNally | 6 | 4 | 6 | 3 | G Andreozzi | 65 | 0r | |||||||||||||||||||
| WC | S Riffice | 4 | 6 | 4 | Q | J McNally | 5 | 1 | |||||||||||||||||||
| 3 | G Andreozzi | 7 | 6 | ||||||||||||||||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 7 | A Menéndez Maceiras | 5 | 0r | ||||||||||||||||||||||||
| S Kozlov | 6 | 6 | S Kozlov | 7 | 4 | ||||||||||||||||||||||
| E Karlovskiy | 2 | 4 | S Kozlov | 2 | 3 | ||||||||||||||||||||||
| L Saville | 6 | 3 | 63 | 12 | J Kubler | 6 | 6 | ||||||||||||||||||||
| A Vukic | 3 | 6 | 77 | A Vukic | 3 | 2 | |||||||||||||||||||||
| 12 | J Kubler | 6 | 6 | ||||||||||||||||||||||||
| 12 | J Kubler | 6 | 6 | ||||||||||||||||||||||||
| 14 | C Eubanks | 4 | 3 | ||||||||||||||||||||||||
| 14 | C Eubanks | 6 | 6 | ||||||||||||||||||||||||
| Jared Hiltzik | 6 | 3 | 6 | J Hiltzik | 3 | 3 | |||||||||||||||||||||
| T Smyczek | 2 | 6 | 3 | 14 | C Eubanks | 77 | 6 | ||||||||||||||||||||
| S Mukund | 4 | 4 | E Escobedo | 62 | 4 | ||||||||||||||||||||||
| E Escobedo | 6 | 6 | E Escobedo | 5 | |||||||||||||||||||||||
| 2 | M Ebden | 0r | |||||||||||||||||||||||||
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.
Steve Johnson was the defending champion, but lost to Donald Young in the first round.
Bradley Klahn won the title over Dan Evans 3–6, 7–6(7–5), 6–4
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.
Alex Bolt was the defending champion but chose not to defend his title.
Noah Rubin was the defending champion but lost in the quarterfinals to Tennys Sandgren.
Andrej Martin was the defending champion and successfully defended his title, defeating Stefano Travaglia 6–4, 6–4 in the final.
Austin Krajicek and Jeevan Nedunchezhiyan were the defending champions but only Nedunchezhiyan chose to defend his title, partnering Purav Raja. Nedunchezhiyan lost in the first round to Jason Jung and Evan King.
Sebastian Ofner was the defending champion but lost in the third round to Aleksandar Vukic.
Bradley Klahn was the defending champion but chose not to defend his title.
Lloyd Harris was the defending champion but chose not to defend his title.
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.
Constant Lestienne was the defending champion but lost in the semifinals to Viktor Durasovic.
Bernard Tomic was the defending champion, but retired in the first round of the qualifying tournament against Denis Istomin.
Bradley Klahn was the defending champion but lost in the third round to Michael Mmoh.
This was the first edition of the tournament.
Taylor Fritz was the defending champion but lost in the third round to Mitchell Krueger.
Mitchell Krueger was the defending champion but lost in the third round to Denis Kudla.
Reilly Opelka was the defending champion, but lost to Jason Jung in the quarterfinals.