PGA Tour: Zach Johnson one shot off John Deere Classic lead with England’s Matt Wallace in contention after first round Sky SportsZach Johnson skips U.S. Senior Open for John Deere, opens with 64 to trail by one shot TSNWhy did a favorite decide to skip the U.S. Senior Open? Zach Johnson’s start at the John Deere Classic offers an answer Golf DigestScorching late: Zach Johnson overcomes heat to card mistake-free back nine at Deere Run Golf Channel
