Tampa Bay Rays' Shane Peterson watches his RBI single off Oakland Athletics' Santiago Casilla during the ninth inning of a baseball game Tuesday, July 18, 2017, in Oakland, Calif. (AP Photo/Ben Margot)
FILE - In this May 19, 2016, file photo, San Francisco Giants closer Santiago Casilla pitches against the San Diego Padres in the ninth inning of the Giants' 3-1 victory in a baseball game in San Diego. Relief pitcher Santiago Casilla is crossing the bay again, re-joining the Oakland Athletics with a two-year contract Friday, Jan. 20, 2017, after seven seasons with San Francisco. Casilla has spent his entire big league career between the two Bay Area teams; his initial six seasons were with Oakland. (AP Photo/Lenny Ignelzi, File)
San Francisco Giants relief pitcher Santiago Casilla, right, hands the ball to manager Bruce Bochy, center, and heads for the dugout as catcher Buster Posey, left, looks on in the ninth inning of a baseball game against the Miami Marlins Friday, May 16, 2014, in San Francisco. Miami won the game 7-5 and Casilla was the losing pitcher. (AP Photo/Eric Risberg)
ASSOCIATED PRESS San Francisco Giants' Santiago Casilla celebrates after getting San Diego Padres' Scott Hairston to ground out in the sixth inning of a baseball game in San Francisco, Sunday, Oct. 3, 2010.