In Tiger's last major, the Open, Tiger missed the cut and Stevie, his caddy, takes the blame. Stevie lost sleep for 2-3 days after the Open because he felt he didn't do his job as Tiger's caddy. Some may dislike Stevie after his comments about Phil, but I've never heard a caddy blame himself for his player's problems on the course. I've also never heard Tiger blame Stevie.
For some insights into Stevie and how he helped Tiger turn that first dismal first round into a victory at the Buick, check out this article by Robert Lusetich.
P.S. Got to love Stevie's wife, who also has a part in Tiger's success.