Why Koepka revels on being on the  brink mentally

One was about power. The other was about patience.

Brooks Koepka has a game for the US Open no matter the course, no matter the test, no matter the circumstances.

He never lost hope when he began his title defence with a 75 and was 7-over par midway through the second round. He didn’t lose his mind in the most punishing third round of a U.S. Open in nearly two decades.