Watson said he didn't make his mind up until about 12 hours before the announcement, and he was swayed by a pair of 5-and-4 victories Simpson had with Bubba Watson at Medinah in 2012.
Chris Kirk refocuses after Ryder Cup snub →
"I made no secret how badly I want to go back and win the Ryder Cup," he said. "This is a redemption year for a lot of guys who were on the team last year."
Keegan Bradley leads captain's picks for U.S. Ryder Cup team →