Matteo Arnaldi defeated Kei Nishikori 6–4, 7–5 in the quarter-final of the ATP Canada Masters on hard court on 10 August 2024, confirming his status as pre-match favourite with odds of 1.54 to Nishikori's 2.63. The Italian maintained control throughout, securing the first set with a break and then withstanding pressure in the second to close out victory in straight sets. Arnaldi's composed performance underlined his growing credentials on the Masters 1000 circuit, whilst Nishikori's exit marked another setback for the former US Open finalist in his pursuit of consistent results at the highest level. The result advances Arnaldi to the semi-finals in Montreal.