Here is a comprehensive summary of the article in English:

At the 2026 Canadian Open, defending champion Ben Shelton defeated Brandon Nakashima in the final with a score of 6–3, 7–6(7–4) to win the men's singles title. Shelton did not lose a single set throughout the entire tournament, capturing his second Masters 1000 title and seventh ATP Tour title overall, while also becoming the first player to successfully defend this title since Rafael Nadal in 2019. The final was historic, marking the first all-American Masters 1000 final since the 2003 Cincinnati Open. The tournament also showcased tennis's youth movement, as it was the first ATP Tour event where all eight quarterfinalists were born in the 2000s, and featured the youngest quarterfinal field at a Masters event since the 2007 Paris Masters. For Nakashima, his run to the championship match was significant, as he emerged as the first-time Masters 1000 finalist from the bottom half of the draw, a path that was guaranteed after Cameron Norrie's fourth-round exit.