Lewis topped Q1 and Q2, en route to a 1:40.593s in the final shootout - securing his fifth pole of the season and his seventh in 10 races.
"My pole lap in Montreal was pretty special, but I think this one here tops that," said Lewis. "My first run in Q3 was actually really good, but I was a bit greedy into the last corner, locked up and cost myself time.
"After the red flag, there was a lot of pressure on that final lap. All weekend we've struggled to switch the car on over a single lap, but it was an all or nothing moment so I just gave it everything I had. Valtteri was on a great lap as well, so when I came across the line and saw that I had pole, it was such a good feeling. Even if that time had only been enough for P2 it was a lap to be proud of.
"We were struggling yesterday but we made a lot of changes overnight. A big thank you to the team who stayed late last night to get the car to where it is today - they did a fantastic job."