Canadian James Hinchcliffe was 16th in 1:01.4874.
Defending Indycar champion Simon Pagenaud set the fastest time of the day's two sessions, clocking 1min 0.2573sec.
"Qualifying was a huge effort for the whole team".
While Castroneves and Pagenaud are closer to Dixon, Power may very well be the biggest threat. "But we're just having fun with that, so that's why the entrance was a bit flamboyant". Last race: Valtteri Bottas dominated in Austria for his second victory of 2017.
Newgarden, who won at Barber Motorsports Park in April, won Sunday's Honda Indy Toronto in convincing fashion.
The Frenchman attended a press conference on Thursday ahead of this weekend's Honda Indy Toronto on the streets surrounding Exhibition Place.
"I think that is twice I have had good calls and got into the pits at the right time", Newgarden said. "Being able to put a ideal lap together in Toronto is very unusual because it's a very tough track". When I got loose in [Turn] 6, I was running over marbles that were like the size of my fist, and it took four laps just to get the rubber back off the auto.
The finish was the third in four races in which Dixon finished outside the top five. He trailed for most of the first round of qualifying but rallied to advance into the second after rookie Esteban Gutierrez's crash.
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After a strong start to the second round, Hinchcliffe fell back but was able to recover on a final shootout lap. Alexander Rossi, who may have had the most impressive auto all day, finished in second. "You're just trying to save your life and give it everything you've got". I'm relieved that we finally kind of got the monkey off our back. But over the years, he said, he's become better at dealing with them. Newgarden won this race two years ago.
Sebastian Saavedra, filling in for Mikhail Aleshin, came home a respectable 11th. Dixon has finished in the top 5 of seven races this year and finished in the top 10 in all but one race. "Hopefully I get a couple more podiums before the end of the year, and we can get it done".
"It's just hard work".
"We had lots of luck when we came here before".
But the 25-year-old driver, who has raced in Formula One, Formula E (an all-electric series) and IndyCar the last two years, remains optimistic about reaching his goal of a top-10 finish in Sunday's 31st renewal of the iconic downtown Toronto street race. His vehicle caught fire, but the driver escaped without injury.
Hildebrand slid into the wall at the exit of Turn 8 in Segment 2 qualifying, when his auto jumped the curb on the inside of the corner and slid straight into the barrier.
He also has enjoyed a long history of success at most of the tracks left on the calendar, including Toronto.
"It would have been nice to give the (crew) guys a win where I haven't won before", he said. "We all want to be the fastest man".