New York Yankees relief pitcher Mariano Rivera delivers a warm-up pitch before the fourth inning of a spring training baseball game against the Pittsburgh Pirates at Steinbrenner Field in Tampa, Fla., Tuesday, March 20, 2012. (AP Photo/Kathy Willens)

Photo by: Kathy Willens

New York Yankees relief pitcher Mariano Rivera delivers a warm-up pitch before the fourth inning of a spring training baseball game against the Pittsburgh Pirates at Steinbrenner Field in Tampa, Fla., Tuesday, March 20, 2012. (AP Photo/Kathy Willens)