Joel Dahmen and Lucas Lee carded matching 67s on Saturday to grab a share of the lead through three rounds of the Syncrude Boreal Open.
Dahmen and Lee sit at 9-under-par 207 through 54 holes at Fort McMurray Golf Club, one stroke ahead of Brett Lederer (68), Tyler Aldridge (69) and David Dragoo (70).
"I put myself in a good position for tomorrow and that's all I was trying to do," said the 25-year-old Dahmen.
Overnight leader Nick Taylor stumbled to a 73 and dropped into a share of sixth place at 7-under. The former World Amateur No. 1 sits alongside Canadian Riley Wheeldon (68), Russell Surber (69) and Jorge Fernandez-Valdes (71).
Defending champion Cory Renfrew (70) and Wil Collins (69), who won last week's Dakota Dunes Open, are part of a group tied for 10th at minus-6.
Dahmen and Lee began the third round in a tie for 11th place, four shots off the lead.
The former started with three straight pars and a bogey before kickstarting his round with a birdie at the fifth and another gain at the eighth to highlight an outward 35.
Lee, meanwhile, played his outward stretch in bogey-free fashion, picking up birdies at Nos. 3, 5 and 6 to stay near the top of a crowded leaderboard.
Dahmen eventually separated himself around the turn, using an eagle at the par-5 11th and birdies at Nos. 14 and 16 to grab the lead at 9-under. The American parred his final two holes to remain there.
Lee also eagled the 11th, briefly hitting minus-9 with that feat, but he stumbled to a bogey at No. 13. After a stretch of four pars, the Brazilian birdied the last to join Dahmen on top.
"I've finished second here four times and I'm ready to try and win tomorrow," said the 25-year-old Lee. "I played very solid today, but I think it's going to take another good round to win."
NOTES: Dahmen and Lee are both seeking their first PGA Tour Canada win ... Dahmen's best finish this season is a tie for eighth at the Dakota Dunes Open ... Lee missed the cut in both of his previous starts this season, at the Dakota Dunes Open and Times Colonist Island Savings Open ... The first round was completed Friday after heavy rain forced a suspension of play on Thursday. This is the third straight tour event that has been hampered by rain.