Butch Harmon
When Tiger was dominating the game's best players in 2000 and 2001, Harmon was the man he turned to on the range for help. But they parted ways in 2002, and Tiger started seeking advice from Hank Haney. Then Harmon said Woods was "in denial" about his game and errant driving during the U.S. Open at Shinnecock Hills in 2004. Woods said, "I don't understand why he would say anything like that, especially when we've been close. He does not know what I'm working on. I don't understand where he is coming from. It doesn't do himself or anyone any good to do that."

Harmon now coaches several of Woods's chief rivals, including Phil Mickelson, Ernie Els and Adam Scott. In fact, at the 2007 Memorial, Harmon said he thought Mickelson could supplant Woods atop the rankings. "Tiger's got a big lead as No. 1 in the world, so it'll take a couple of years, but I think [Phil] can, and I think he will actually."