Thanks Parker, I always look forward to hearing from an analytic perspective. I was messing around with Nolasco's Pitch f/x data and found something interesting. Using the time period you do (comparing 2011-July 2012, and after the switch, July 2012-Today), I looked at swinging strike % by pitch, a significant indicator of success. By far, Nolasco's pitch that benefited the most from the change is his splitter. Hitters often confuse splitters with fastballs, which is to say that the success of a pitcher's splitter relies on his ability to effectively use/locate his fastball. Here are the numbers: Fastball: Swinging Strike % before change- 10.46%.....After- 11.24% Frequency Used before change- 31.64%.....After- 22.88% Splitter: Swinging Strike % before change- 26.32%.....After- 34.82% Frequency Used before change- 11.85%.....After- 12.40% Nolasco still throws his splitter with roughly the same frequency, but its effectiveness has spiked. I believe, as you pointed out, that Nolasco has benefited from his shift and improved his control. He doesn't need to rely on his fastball nearly as much, but hitters seem to respect it more, frequently confusing splitters for fastballs. In my opinion, Nolasco has done a better job locating and using his fastball (inside) and hitters have had to respect it. As a result, his splitter has spiked in efficiency. This was my personal take on it, let me know what you think. Thanks again Parker (all data comes from Brooks Baseball)