Ubaldo Jimenez was by far the most dominant pitcher in the first half of the 2010 season. But after the All Star break, his numbers started to decline. For the first half of the season, Jimenez went 16-2 with a 2.20 ERA; batters hit .198/.280/.302 against him. But in the second half, he managed only 6 wins in 15 starts, with a 3.80 ERA.
One noticeable change in Ubaldo's second half was his fastball location. Take a look at the difference in how he spots the pitch in the second half:
Jimenez began to leave his fastball up more as the season progressed. However, this only accounted for a .033 point jump in batters' wOBA versus the pitch. In fact, Jimenez actually saw an increase in his strike out rate on fastballs. While his second half decline was fairly stark, the fastball doesn't seem to be at the root of his problems.
In a post to follow, we'll take a closer look at some of his other pitches down the stretch.