We should have known when the Golf Channel interview with Brooks Koepka was leaked. Leaked, as if this were a highly sensitive issue that someone didn’t want out. Koepka lost concentration during an interview because his rival Bryson DeChambeau walked behind him in the picture and snickered or sneered or burped or something. And the story of golf in the weeks since then has been the great, heated rivalry between two stars. It’s great for golf! It’s what golf needs! The other focus of golf, Phil Mickelson winning the PGA Championship, doesn’t have legs. He turns 51 today, after all. That’s more than seven in dog years. So enjoy the Koepka-DeChambeau show, but just know that you’re being played. My guess is that most people know that already, but don’t really care. It’s fun watching a fight with the tough-guy modern weapon of choice: the tweet. Koepka and DeChambeau are getting so much from that leak. The Golf Channel, too. And golf itself.  The U.S. Open starts Thursday, and Koepka and DeChambeau are the favorites. There were reports — and denials — that tournament organizers asked Koepka and DeChambeau to play together, but both said no. Where did that story […]