Checking in With James Paxton
Coming into the season, you might have had a three-part checklist for Mariners’ lefty James Paxton. Can he throw more high fastballs, can he improve his changeup, and can he hold his velocity and command? We know his curve is good, and most years, he has the big velocity that has turned our attention to him. But these three items sum up the healthy skepticism that still remains, and the pitcher knows all about them.
Jeff Sullivan recommended high fastballs for Paxton because his fastball has rise but he throws it low. Currently the Seattle lefty is showing almost exactly the same whiff and strikeout rates as he showed last year, so maybe he wasn’t listening.
Except that he was! “I do utilize the high fastball, to work off of it, and have the curveball drop off it,” Paxton said of the fact that high fastball release points can help mask a high curveball release point.
But the pitcher also admitted that the high fastball was “probably something I could work into my game a little more effectively.” He’s been trying, as you can see from the fastball heat maps below from Baseball Savant (2014 on the left, 2015 on the right). If you prefer numbers, Paxton has thrown 29% of his fastballs in the top third of the zone this year, up from 25% last year. And his rank with respect to his peers has changed, as he used to be in the 41st percentile for high fastballs, and so far this year, he’s in the 31st percentile.


