Weaver's Lack of Zip, Whiffs a Growing Concern
Saturday, March 23, 2013 at 10:13AM
David Golebiewski in Angels, Jered Weaver, Los Angeles Angels of Anaheim, strikeouts

With a lanky, 6-foot-7 frame and a cross-fire delivery that baffles hitters trying to pick up the ball, Jered Weaver exudes deception. But can Weaver, coming off a 20-win season, keep tricking batters as he enters his thirties and becomes one of the game's softest tossers? Fangraphs' Paul Swydan isn't so sure (ESPN Insider subscription required):

"Over the past couple of years his velocity -- as well as his strikeout and swinging-strike rates -- has declined...With his 20s behind him, Weaver is unlikely to see these trends suddenly reverse themselves, and he will become even more reliant on his control and defense."

Weaver struck out a career-best 25.7% of batters faced in 2010. Since then, his punchout rate his nosedived to 21.4% in 2011 and 19.2% this past season. On a related note, Weaver's fastball velocity has declined three years running: 89.9 MPH in '10, 89.1 MPH in '11, and just 87.7 MPH in 2012.

Weaver's fastball beat out just R.A. Dickey's and Bronson Arroyo's in velocity among right-handed starting pitchers last year. Yet, the pitch has defied logic by remaining highly effective despite a gargantuan dip in swings and misses. Let's take a closer look at Weaver's not-so-fast fastball, and what that velocity loss could mean for him in 2013.

Here is Weaver's fastball contact rate by pitch location over the past three seasons:

Weaver's fastball miss rate by pitch location, 2010


Weaver's fastball miss rate by pitch location, 2011


Weaver's fastball miss rate by pitch location, 2012

Back in 2010, batters swung and missed at Weaver's fastball 19.6% of the time. That was seventh-highest among all qualified starters, beating out the likes of Clayton Kershaw, Max Scherzer and Justin Verlander. Weaver's fastball miss rate fell to 15.9% in 2011, and came in at a paltry 12% in 2012 -- below the 14% MLB average and in the same finesse lefties like Paul Maholm and Tommy Milone.

But while hitters are making  much more contact against Weaver's fastball, they're not doing any more damage. Check out Weaver's fastball slugging percentage by location from 2010-12:

Weaver's opponent fastball slugging percentage by location, 2010


Weaver's opponent fastball slugging percentage by location, 2011


Weaver's opponent fastball slugging percentage by location, 2012

Opponents slugged .393 against Weaver's fastball during his high-strikeout 2010 campaign, about 60 points below the major league average. Weaver's opponent fastball slugging percentage actually fell to .322 in 2011, and barely budged in 2012 (.333) as he started putting up radar gun readings that wouldn't get him pulled over by highway patrol.

Weaver's success with such a slow heater is exceptionally rare. Last year, hitters slugged .513 against fastballs thrown between 87 and 88 MPH. Basically, batters morphed into Albert Pujols when a pitcher lobbed a fastball in that velocity range. Can Weaver keep getting outs with a fastball that only the Zitos and Buehrles of the world consider fast? He does have some advantages over other soft-tossers:

Weaver's lack of zip is concerning. Most pitchers who sit in his new, low-octane velocity range get pummeled. But if ever there were a case where a guy could Houdini his way to another 20 wins, it's Jered Weaver in 2013.

Article originally appeared on MLB Baseball Analytics (https://baseballanalytics.org/).
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