LOS ANGELES (AP) — Brooks Koepka was so frustrated that he broke his irons over his knee — twice. He was coming off three missed cuts in a row and frustrated trying to get his game back. And then he won the Phoenix Open and all is well again. Koepka arrived at Riviera for the Genesis Invitational with a healthy dose of confidence and the same set of irons. Dustin Johnson also is coming off a victory in Saudi Arabia. He has no confidence issues at all. They are part of the strongest field of the year at one of the best courses.
