San Francisco Giants' Buster Posey, left, smiles as he passes home plate umpire Joe West after hitting a walkoff home run off Los Angeles Dodgers' Ronald Belisario in the ninth inning of a baseball game Friday, May 3, 2013, in San Francisco. (AP Photo/Ben Margot)

SAN FRANCISCO, CA - MAY 03: Buster Posey #28 of the San Francisco Giants rounds the bases after hitting a walk-off home run off of Ronald Belisario (not pictured) of the Los Angeles Dodgers in the ninth inning at AT&T Park on May 3, 2013 in San Francisco, California. The San Francisco Giants defeated the Los Angeles Dodgers 2-1. (Photo by Jason O. Watson/Getty Images)

Los Angeles Dodgers' Ronald Belisario walks off the field after giving up the game winning home run to San Francisco Giants' Buster, running the bases background right, in the ninth inning of a baseball game Friday, May 3, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco Giants' Buster Posey, third from right, is mobbed by teammates after hitting the game winning home run off Los Angeles Dodgers' Ronald Belisario in the ninth inning of a baseball game Friday, May 3, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco Giants' Buster Posey swings for the game winning home run off Los Angeles Dodgers' Ronald Belisario in the ninth inning of a baseball game Friday, May 3, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco Giants' Buster Posey, left, smiles as he passes home plate umpire Joe West after hitting a walkoff home run off Los Angeles Dodgers' Ronald Belisario in the ninth inning of a baseball game Friday, May 3, 2013, in San Francisco. (AP Photo/Ben Margot)

PHOENIX, AZ - APRIL 13: Relief pitcher Ronald Belisario #51 of the Los Angeles Dodgers pitches against the Arizona Diamondbacks during the MLB game at Chase Field on April 13, 2013 in Phoenix, Arizona. (Photo by Christian Petersen/Getty Images)

LOS ANGELES, CA - APRIL 02: Ronald Belisario #51 of the Los Angeles Dodgers reacts on the mound after the San Francisco Giants scored two runs off of a throwing error during the seventh inning at Dodger Stadium on April 2, 2013 in Los Angeles, California. (Photo by Harry How/Getty Images)

GLENDALE, AZ - FEBRUARY 17: Pitcher Ronald Belisario #51 of the Los Angeles Dodgers poses for a portrait during spring training photo day at Camelback Ranch on February 17, 2013 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)

GLENDALE, AZ - FEBRUARY 17: Pitcher Ronald Belisario #51 of the Los Angeles Dodgers poses for a portrait during spring training photo day at Camelback Ranch on February 17, 2013 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)