The Canadian charge at the PGA's Workday Charity Open in Ohio didn't last.
American Colin Morikawa held the top spot with his second round of 6-under-66. He has 13-under to lead the field.
Nick Taylor, who was in third after the first round, dropped into a tie for tenth, he's at 6-under. And Adam Hadwin who was in second fell into a tie for 15th at 5-under. Mackenzie Hughes is also at 5-under.
Listowel's Corey Conners improved, shooting a 3-under-69 is at 4-under heading into the weekend rounds.
