Before Corey Kluber became the poster child for Mickey Callaway's pitcher whispering, the best example might have been this 2013 Indian who performed better with the Tribe than he had the previous year with the Sugar Land Skeeters (5.34 ERA). While he has never become the ace that he was expected to, he surely has been more valuable than Victor Zambrano, for whom the Mets traded him in 2004.
Name this left-handed starter, who most recently appeared with the 2016 Los Angeles Dodgers
Scott Kazmir