Washington Nationals' Ryan Zimmerman (11) is congratulated by third base coach Bo Porter (16) following his two-run home run off of Arizona Diamondbacks pitcher Trevor Cahill during the fifth inning of a baseball game Friday, Aug. 10, 2012, in Phoenix. (AP Photo/Ralph Freso)
Oakland Athletics starting pitcher Trevor Cahill pitches during fourth inning AL action against the Toronto Blue Jays in Toronto on Thursday, April 7, 2011. (AP Photo/The Canadian Press, Frank Gunn)
Oakland Athletics' Trevor Cahill wipes his face during the first inning of a baseball game against the Seattle Mariners Friday, April 1, 2011, in Oakland, Calif. (AP Photo/Ben Margot)
ASSOCIATED PRESS Oakland Athletics' Trevor Cahill, right, is visited on the mound by A's pitching coach Curt Young, center, and catcher Jake Fox (50) during the sixth inning of a baseball game against the Minnesota Twins Saturday, June 5, 2010, in Oakland, Calif.
