Chicago Cubs pitcher Jake Arrieta lifts his arm during the fifth inning of a baseball game against the San Francisco Giants, Tuesday, May 27, 2014, in San Francisco. (AP Photo/George Nikitin)
San Francisco Giants' Michael Morse hits an RBI single against the Chicago Cubs during the first inning of a baseball game, Tuesday, May 27, 2014, in San Francisco. (AP Photo/George Nikitin)
Chicago Cubs pitcher Jake Arrieta throws to the San Francisco Giants during the first inning of a baseball game, Tuesday, May 27, 2014, in San Francisco, (AP Photo/George Nikitin)
Chicago Cubs' Anthony Rizzo looks back after striking out against the San Francisco Giants during the first inning of a baseball game, Tuesday, May 27, 2014, in San Francisco. (AP Photo/George Nikitin)
Chicago Cubs pitcher Jake Arrieta throws to the San Francisco Giants during the first inning of a baseball game, Tuesday, May 27, 2014, in San Francisco. (AP Photo/George Nikitin)
San Francisco Giants pitcher Tim Hudson throws to the Chicago Cubs during the first inning of a baseball game, Tuesday, May 27, 2014, in San Francisco. (AP Photo/George Nikitin)
San Francisco Giants pitcher Tim Hudson throws to the Chicago Cubs during the first inning of a baseball game, Tuesday, May 27, 2014, in San Francisco. (AP Photo/George Nikitin)