PGA Live Updates | Dustin Johnson surges to 4 under through 13 to share lead PGA Championship

PITTSFORD, N.Y. (AP) — Dustin Johnson is showing no signs of a back injury he blamed on hampering his start to the year. The two-time major winner has birdied four of his first 13 holes in the first round of the frost warning-delayed PGA Championship at Oak Hill. That puts him in a tie for the lead with Bryson DeChambeau who completed his round earlier in the day. The 38-year-old Johnson is coming off a win at LIV Golf Tulsa last weekend. Fellow LIV player Phil Mickelson is at 2 over through 12 holes.