"I was frustrated because I thought my game was better," Johnson said.
Zach Johnson optimistic about game after 2 years without win →
"Just kept the course in front of me and played solid golf," Johnson said, winless since the 2015 British Open at St. Andrews. "Made a few putts, missed a few putts. But I'm very encouraged with the direction."
Kirk, Zach Johnson lead Sony Open, Spieth takes late tumble →