Scott Piercy and William McGirt have both finished 11-under-par to share the lead at the Canadian Open.
Only a shot separated the Americans after round one, but McGirt reversed the scoring in the second round to take a share of the lead.
England's Greg Owen could not match his opening-round 63 and could only record a 72 in the second to drop down the field.
Robert Garrigus and Bo Van Pelt are the closest challengers to Piercy's and McGirt's lead, sitting just one and two shots behind respectively.
