Zach Johnson is skipping the U.S. Senior Open this week and instead plays the John Deere Classic. Yahoo Sports reports that the 50-year-old, in his first season on PGA Tour Champions and already with two wins, does not plan to treat the John Deere Classic as secondary despite the major events running concurrently. Johnson is from Iowa and opens the tournament with a 64, placing him one shot behind the leaders after the first round. In the morning session, Lucas Glover and Zac Blair also post strong early scores, each firing 63. Their rounds provide momentum as the PGA Tour enters its final two months of the season. The available reporting does not indicate whether Johnson is changing his broader schedule beyond the decision to miss the Senior Open, nor does it detail leader board positions beyond the one-shot deficit for Johnson after opening play.