There was little between Auger-Aliassime and Bublik in the first set on Saturday, with 12 straight holds to start the match, and the Canadian sneaking out the 50-minute opening frame in a tie-break.
There were all kinds of momentum swings in the second set, though, as Bublik broke early for a 2-0 lead—and then, after getting broken right back, breaking again for a 3-1 lead, and then holding for 4-1.
But Auger-Aliassime caught fire from there, reeling off five games in a row—and 14 of the last 17 points of the match—to close it out.
The Canadian finished with more than twice as many winners as the Kazakh, 31 to 15, as well as fewer unforced errors, 21 to 23.
"I'm so happy. A Masters 1000 final sounds really good," Auger-Aliassime said after the match. "You don't play those finals every week, every day, so hopefully I can go all the way and get the title.
"But in terms of today, and even the last matches, you get to a Masters and every match is tough. It's a 56 draw, it's stacked, you wake up every day and this guy's playing good, this guy's playing good, everybody's playing good. So you're always curious and a bit nervous about how your game's going to match up with them.
"I have deep self-confidence in my game and I know what I can do against the best players in the world, but you still have to go and execute, and today I did really well, and I'm happy with the result."