BLAINE, Minn. – Richy Werenski made a short birdie putt on the par-5 18th for an 8-under 63 and the first-round lead Thursday in the 3M Open, while Dustin Johnson withdrew because of a back injury after a 78.
The 24-year-old Werenski is winless in on the PGA Tour and ranked 248th in the world. He broke a tie with Michael Thompson with his ninth and last birdie on the warm, windy afternoon at the TPC Twin Cities.
Defending champion Matthew Wolff, Tony Finau, Nick Watney, Ryan Moore, Xinjun Zhang and Max Homa were tied for third at 65.