ATP - Toronto 1R start

First round commenced in Toronto.

2023 National Bank Open presented by Rogers, an ATP Masters 1000 tournament, on Hard Outdoor, Toronto, Canada, 7-13 August 2023.

2022 champion (not defending):

Pablo Carreno Busta who defeated Hubert Hurkacz (8) 3-6 6-3 6-3

Grigor Dimitrov withdrew after the main draw was published due to back pain, and was replaced by lucky loser Aleksandar Vukic.

First round results:

- Miomir Kecmanovic defeated qualifier Cristian Garin 7-6(2) 4-6 6-4

- Hubert Hurkacz (15) defeated Alexander Bublik 6-3 7-6(2)

- Tommy Paul (12) defeated qualifier Diego Schwartzman 6-3 3-6 6-4

- Francisco Cerundolo defeated wildcard Alexis Galarneau 6-2 4-6 6-4

- Gaël Monfils defeated Christopher Eubanks 7-6(3) 6-7(4) 6-1

- Matteo Berrettini defeated Gregoire Barrere 6-4 6-3

- Qualifier Taro Daniel defeated Adrian Mannarino 7-6(5) 6-4

- Wildcard Milo’s Raonic defeated Frances Tiafoe (9) 6-7(12) 7-6(4) 6-3

- Alejandro Davidovich Fokina defeated J.J. Wolf 6-0 6-2

- Jiri Lehecka defeated Brandon Nakashima 7-5 3-6 7-6(2)

- Lorenzo Musetti (16) defeated Yoshihito Nishioka 6-4 6-1

- Qualifier Thanasi Kokkinakis defeated Zhang Zhizhen 7-5 6-4

- Qualifier Matteo Arnaldi defeated wildcard Vasek Pospisil 6-4 6-4