The world No.1 extended his winning run on hard courts to 25 matches on Thursday with a ruthless dismissal of 23rd seed in just 71 minutes to reach the semi-finals.
Playing in his first tournament since lifting a fourth grand slam title at Wimbledon, the defending champion powered to a 6-0 6-2 victory over Auger-Aliassime.
The Canadian had won both his previous matches against Sinner but could offer little resistance here, with the Italian beginning and ending the contest with runs of six games in a row.
Sinner has not been beaten on his favourite surface since a loss to Carlos Alcaraz in Beijing in early October last year.
He delivered a dominant performance, capitalising on his opponent's 29 unforced errors.
"Today I felt great on court. I think you saw that but every day is going to be different," Sinner said.
"Tomorrow is a day off, which is good for me. We will try and put some reps in and then see what I can do in the semis."
Sinner became only the fifth man this century to record 25 consecutive victories on the surface alongside Roger Federer, Novak Djokovic, Rafael Nadal and Andy Murray.
He will next face French qualifier Terence Atmane, who continued his impressive run by upsetting Danish seventh seed Holger Rune 6-2 6-3.
"I don't think any words can describe how I feel right now," Atmane, 23, said.
"It's pretty insane to be honest. I cannot believe it.
"Being here in the semi-finals of a Masters 1000, breaking into the Top 100 and even more with the win tonight — it's also a lot of money for me, so it's going to be very helpful for my career. It means a lot to me. I'm very emotional about it."
Canadian Open champion Ben Shelton beat Czech 22nd seed Jiri Lehecka 6-4 6-4 to advance to the last eight, where German third seed Alexander Zverev awaits.
"I'm hungry. I'm in a good rhythm," fifth-seeded Shelton said.
"I'm playing good tennis and my body feels good.
"I think the confidence along with not being satisfied, wanting to prove myself over and over every time that I'm out on the court, and having things that I want to get better at is a huge motivation for me and it pushes me every match."
With Reuters
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