Zack Greinke is an incredible pitcher, as his 2.63 ERA during the regular season was fourth-best in the National League. Even though that ERA during the regular season hasn't amounted to any wins for the Dodgers in the playoffs, he has been able to carry his success into the postseason.
However, Greinke might be the best pitcher in the entire league if he would just quit throwing his two-seam fastball.
In each of the past two seasons, Greinke's two-seamer (listed by FanGraphs as FT) was by far his least valuable pitch. Opponents had an overall OPS of .663 and .647 against him in 2012 and 2013, respectively. Against his two-seam fastball, those numbers were .748 and .760.
Aside from the two-seam fastball, opponents' worst batting average against any pitch of Greinke's in the past two seasons was his cutter. In 2012, opponents batted .276 against it.
Last season, opponents batted .303 against his two-seamer and raised that average to .310 this season.
And yet, it's still one of the pitches he uses the most in his repertoire. In Game 1 against the Cardinals, Greinke threw the two-seam fastball 23 times. Among those 23 pitches the Cardinals collected three singles, Carlos Beltran's two-run double and two lineouts. Eight of those pitches were put into play, and only two resulted in easy outs.
Greinke throws six different pitches, but Los Angeles' chances of a Game 5 win would be improved if he limits himself to just the other five.