Using FanGraphs (I love you), here are a few interesting trends that we’ve witnessed in relation to our displaced ace, Chien-Ming Wang. While I noticed the following items by simply looking at the provided stats, Peter’s post at FG certainly solidified my line of thought.
Wang’s GB% (ground ball) from ‘05-08:
2005 = 63.9%
2006 = 62.8%
2007 = 58.4%
2008 = 55.0%
Interestingly, CMW’s GB% had decreased with every year. He’s throwing it less and we’ve basically seen a 9% drop in its use since he came into the league. Now, is this truly a cause for concern or is this CMW switching things up a bit, in order to diversify his pitching portfolio? Well, let’s look at Wang’s K/9 numbers since 2005.
2005 = 3.64
2006 = 3.14
2007 = 4.70
2008 = 5.12
Clearly, one can see that Wang was striking more hitters out this year. His GB% is decreasing while his K/9 is actually increasing. So what if he’s striking out more people instead of acquiring ground outs, that’s not bad, but what gives? If he is striking out more people, how is he doing it? Well, one can then ask, what is he throwing if he’s not using the GB as much?
2005 = 12.9%
2006 = 14.7%
2007 = 16.2%
2008 = 17.1%
That’s how often Chien-Ming Wang threw his slider over the past 4 years. Since 2005, CMW has upped his slider production with every year (obviously, he throws his FB the most). Essentially, it becomes evident that Wang is throwing more and more sliders in order to strike out more hitters. His subsequent GB% has been hampered, although the numbers are still high. However, one must also note the following in relation to Wang’s increase in K’s and sliders:
2007 = 2.66
2008 = 3.32
The provided numbers are Wang’s B/9 figures. As seen here, Wang walked (or at least he would walk) more people in 2008 than he did in 2007. He’s basically sacrificing some control in order to K more hitters and throw more sliders. Despite this, Wang still maintained a solid ERA, but his WHIP was the highest it has been since he joined the Yankees (1.32).
Hmmm, does this worry you (decreasing GB%, increasing B/9, etc.) or do you think it’s simply a young pitcher developing?