Jonathan Sanchez Isn’t As Good As His K%
From 2008 to 2011, Jonathan Sanchez has the fourth highest strikeout rate (24.1%) of any starting pitcher in baseball (500 IP minimum), ranking behind only Tim Lincecum, Clayton Kershaw, and Yovani Gallardo. Given this ability to consistently miss bats, Sanchez is often lauded as a pitcher with a lot of untapped potential. Pitchers who can post those kinds of strikeout rates are often quite successful, and if Sanchez could just refine the other parts of his game, he looks like he could turn into a dominant starting pitcher.
There’s just one problem – Sanchez isn’t even close to refining those other parts of his game, and we simply can’t ignore that he’s a massively flawed pitcher. Over the same time period (and again, 500 inning minimum), no starting pitcher has posted a worse walk rate than Sanchez’s 12.3% mark, and it’s not even all that close. The next worst mark is Gio Gonzalez, more than a full percentage point behind, and he is then followed closely by Barry Zito.
Sanchez’s high walk and high strikeout rates are the product of his propensity for pitching up in the strike zone, where contact is less frequent but so is the likelihood of getting a called strike. By pitching up in the zone, Sanchez is essentially choosing a strategy that increases the likelihood of deep counts, thus increasing both his walk and strikeout rates. Unlike some other high walk/high strikeout pitchers who simply need to improve their command of premium stuff, Sanchez is getting his whiffs through location, and if he began to throw more strikes, he’d likely see a significant drop in his strikeout rate as well.

