Seamus Power carded a third successive under-par round at the Rocket Mortgage Classic to sit in a tie for fourth place ahead of Sunday's final round.
The Waterford man is five shots off leader Matthew Wolff, on 19 under par, at the Detroit Golf Club in Michigan.
Power added a three-under-par round of 69 to opening scores of 67 and 66.
Saturday's round included four birdies and one bogey.
The Irish flag on the leaderboard is surrounded by the Stars and Stripes, with Americans Ryan Armour and Bryson DeChambeau on 16 under, two shots ahead, while Troy Merritt and Mark Hubbard are also on 14 under par.
Leader Wolff had made the most of a rollercoaster round to take a three-shot advantage into the final day.
The 21-year-old balanced three bogeys with a whopping nine birdies and an eagle to close out the day shooting an eight-under 64 and move into pole position ahead of Sunday's conclusion.
After his round, he added that it felt like he made a birdie every time he heard the ice cream truck make its way around a course that was closed to spectators in a bid to stem the spread of Covid-19.
"I heard the ice cream truck and I'm like, I have a good feeling about this," Wolff said about the 35-foot birdie putt he made at the par-three fifth.
"Just had that little like ice cream truck song in my head and I think that helped me just not think about the speed or the line or anything, just keep my head free."