Wong, who turned pro in mid-July, fired a 68 on Saturday to match Denton (67) atop the leaderboard at Scarboro Golf and Country Club.
"There's going to be some pressure out there (on Sunday). I know I'm going to feel it and hopefully what I've learned as an amateur will help me," Wong said. "My short game kept me in it today. I wasn't hitting it as well as the last two days but I made some really nice up and downs to keep myself in it."
Wong will need to fend off Denton, who has two second-place finishes on the Canadian Tour.
"I love it in Toronto," said Denton, who had five birdies and one bogey on Saturday. "Scarboro is an awesome golf course.
Sitting one shot back of Wong and Denton is 2011 international rookie of the year Joe Panzeri (70) and Canadian Tour rookie and fellow American Stephen Bidne (69).
Matt Makinson (69) of Coquitlam, B.C., is in a five-way tie for fifth at 8 under.