Nathan Eovaldi needs to learn the art of deception

Gregory Fisher-USA TODAY SportsEntering the 2015 season, Nathan Eovaldi's goal was simple: develop an off-speed pitch. His brief foray into throwing a circle change in Miami was a disaster, so he worked with Larry Rothschild to develop a splitter instead. For the first part of the season, that pitch looked more like a forkball, staying around the mid 80's with very little spin. Then, as his velocity charts show, he tweaked that pitch into a true splitter, with a spike in velo in June:

Since June 26, Eovaldi was a force in the Yankees rotation, with an ERA of 3.46 and an FIP of 2.90. He also struck out 7.7 batters per nine innings. While that figure is not the most impressive out there, a…