Jordan Spieth has history on his mind as he eyes a third major in 2015

HAVEN, Wis. -- The chance at winning his third major title of 2015 ran across Jordan Spieth's mind as he walked off the 10th green.

Spieth had watched Phil Mickelson torch the back nine at Whistling Straits on TV prior to his Saturday tee time. So with a par at the par-4 10th, Spieth told himself to turn it on: "I said, 'All right, it's now or never' at that point.' "

Right there, Spieth saved the possibility of adding yet another major in 2015. A back-nine torching of his own -- three strokes better than Mickelson's, produced an inward 30 for the 22-year-old, clinching a spot in the final group. It's a familiar spot for Spieth -- who played with Day in the final grouping at the British Open just a month ago. We know what happened there.

And so does Spieth.