Last night, in a close loss to the Dodgers, Ross Detwiler ended up only throwing 3 innings, because he had back spasms. He certainly looked hurt, and while it could have been worse, we still don’t know if he’ll make his next start. Back spasms usually don’t mean an extended absence, but missing a start or two wouldn’t be out of the question. Hopefully it won’t come to that, but if it does, there is an obvious choice for the spot start.Stammen

Zach Duke and Chris Young are names that come up as spot starters, but Young has been awful in AAA this year and Duke has been pretty awful as well, although at least its in the majors. Craig Stammen, on the other hand, is the type of  middle inning/long reliever that often fits into a spot start role, and his recent success indicates he can handle MLB hitters much better than the other two.

Craig Stammen looked great in relief of Detwiler last night. He went 3 IP, allowed 2 H, 0 BB, 0 ER and got 3 K. He did what he’s basically done all year, and all of last year, which is get guys out. Since he was called up in 2011 as a reliever (he had been a starter in the majors before that, and spent all of 2011 starting in the minors), he has been spectacular. He’s appeared in 77 games, thrown 118 2/3 IP and has 121 K to 45 BB. His ERA in that time is 2.20.

His success has all come in the bullpen, he just wasn’t a very good starter. But he also turned the magic age of 27 in 2011, so maturity might have something to do with it as well.

[button url=’#’ size=’small’ style=’blue’] Pitch Selection [/button]

Last night he threw 26 2 seam fastballs (67%), 9 sliders (23%) and 4 curveballs (10%). Other than a lack of curves to righties (perhaps surprisingly, only 1 of his curves came against righties), he didn’t vary much depending on the hitters’ handedness.

This isn’t too far off from what he’s done in the rest of 2013, with a noted lack of the 4 seamer. But this year he’s thrown majority (51%) of that 2 seamer/sinker, followed by the slider (25%). The remaining quarter of his pitches are the 4 seamer (12%) and the curve (12%). His 2012 numbers are pretty close to that, with a little bit more slider and a little less 4 seamer.

Compare this with his 2009 and 2010, and there is a stark difference. I’m starting to include too many numbers in paragraph form, so let’s just lay it out in a spreadsheet table:


Its pretty clear that he has a very different pitch selection since returning from his extended stint in the minors in 2011. He has basically switched his 4 seamer for his 2 seamer, and has almost completely abandoned the changeup. That’s not a minor change, switching your favorite pitch and your 4th favorite pitch.

His success throughout the last three years has something to do with moving to the bullpen, I’d be willing to bet. But even more important is his use of a completely different pitch as his primary offering. In 2012, his sinker averaged 92.23 mph, with a -8.23 Horizontal movement and a 5.49 Vertical. In 2010, his 4 seamer averaged 91.26 mph with a -6.10 Horizontal movement and a 8.37 Vertical. I’m no pitching coach, but it seems like his 2 seamer is faster, with more horizontal movement and less drop.

The first two things make sense as beneficial, but when you think about it the third might as well. Too much drop and the high FBs that you want batters to swing under can drop into the zone, becoming delicious meatballs, and those that you are hoping to be strikes may drop out. That’s pure speculation on my part, though.

[button url=’#’ size=’small’ style=’blue’] Stammen as a Starter [/button]

The new pitches have helped make Stammen a different, and much better, pitcher. He’s improved his velocity over the years a bit as well, although that doesn’t appear to be from the extra rest of being a bullpen guy. In fact, that velocity improvement showed up immediately in his 2011 September callup, despite being a starter throughout August in the minors.

There is no reason to think that he can’t be successful as a starter, with his new pitch selection. He’s not just a two-pitch pitcher, although Ross Detwiler shows even they can be successful in the rotation. He has confidence in his pitches and he’d have to go out and throw as hard as he does out of the bullpen, without worrying about what may happen 5 innings later. But if he does that, he certainly has the capability to start.

At some point during the season, there will be a need for a spot starter, whether its Det’s next start or not. I’d love to see Stammen get that shot, because whether its as trade bait or as their potential #5 next year, he’d be more valuable as a good starter than a really good 6th/7th inning guy.

Credit once again to Brooks Baseball for all the PitchFX data

By Charlie