Zach Johnson wins the Kaulig Companies Championship at Firestone Country Club, claiming his first senior major title. Multiple reports describe a dominating performance over the weekend at a rain-softened course. After early scoring and a shift in conditions, Johnson builds a lead and maintains control through the final rounds, finishing with a six-shot victory in the overall tournament. One outlet highlights that Johnson shoots a 63 in rain-softened conditions to take a four-shot lead, setting up the final stretch. Another emphasizes the broader context of Firestone C.C. holding its last pro event for the foreseeable future, framing the win as part of the venue’s farewell week. Across the coverage, the central points remain consistent: Johnson takes command during the tournament, separates himself from the field, and ends with a clear margin of victory to secure the senior major. The reports also indicate that the event is played under weather-affected conditions, with rain influencing how the course plays.