Prior to the beginning of this season, we took a look at the change in Zack Greinke's (MIL) curveball between 2009 and 2010. Getting his curveball back on track is important for Greinke this year, especially if he is going to get back to his Cy Young form from two years ago.
So far this season, batters are swinging and missing at his curve at a higher rate than against any other pitchers' curve. He's yielded only one hit off the pitch, a ground ball single to Jose Tabata (PIT) on May 15th.
In 2009, Greinke had an average BrkZ (vertical inches of break from spin) reading on his curveball of -4.2. In 2010, that number was cut in half to -2.0 inches of downward break - and as noted in the previous post on Greinke, batters were teeing off on it. This season, his curve has a BrkZ reading of -6.8. While his overall numbers haven't been great through his first 4 starts, a working curveball is a good sign for the 2009 Cy Young winner.