1h ago The Canadian Press Richy Werenski , Christian Petersen/Getty Images 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.