Bill James thinks Sabermetrics has overrated ground ball pitchers

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Rob Neyer expounded on a Bill James piece (here, behind a paywall) at SB Nation in which James says that proponents of Sabermetrics have “horribly overstated” the case for ground ball pitchers. He cites a handful of elite pitchers — Tom Seaver, Bob Gibson, Randy Johnson, Justin Verlander, among others — and points out that they weren’t very good in the ground ball department. He also cites a handful of ground ball pitchers — namely Chien-Ming Wang and Brandon Webb — who have had serious issues with injuries.

What I have never understood about ground ball pitchers, and do not understand now, is why they always get hurt. Show me an extreme ground ball pitcher, a guy with a terrific ground ball rate, and I’ll show you a guy who is going to be good for two years and then get hurt.

[snip]

They’re great for two years, and then they blow up. Always.

The one exception to James’ analysis is, of course, Derek Lowe, who made at least 32 starts in each season from 2002-11.

I don’t think we have the capability to make a strong conclusion one way or another based on the quality of data we have right now. Presently, there is no differentiation between types of batted balls. There is a vast difference between a dribbler down the third base line and a screamer up the middle. FanGraphs differentiates between infield and outfield flies, which has helped us to better appreciate pitchers like Matt Cain and Jonathan Papelbon. No such distinction is made for ground balls.

There is no way of knowing now, of course, but there may be a link between injury risk and the types of ground balls a pitcher induces. Basing analysis on data that utilizes binary qualitative groups — “on the ground” and “not on the ground” — is far too broad.

(Tip of the cap to David Schoenfield at ESPN Sweet Spot for directing me to Neyer and James.)

Report: Twins sign Erick Aybar to minor-league deal

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The Twins have reportedly signed free agent shortstop Erick Aybar to a minor-league deal, LaVelle E. Neal III of the Star Tribune reported Friday. FanRag Sports’ Jon Heyman adds that the deal comes with a potential $1.25 million if Aybar reaches the majors, with additional incentives based on plate appearances. He’ll be able to opt out on March 27. The team has yet to confirm the signing.

Aybar, 34, is now four years removed from his career year in 2014. He’s been in a state of steady decline since then, slashing just .234/.300/.348 with seven home runs and 11 stolen bases over 370 plate appearances for the Padres in 2017. His poor performance wasn’t helped by a fractured left foot, either, which cost him almost six weeks on the disabled list.

Still, the Twins see something promising in the veteran infielder, and reportedly intend to use him as another utility option this spring. Per Neal, Aybar will join fellow backup infielders Eduardo Escobar and Ehire Adrianza and may even (temporarily) take over for Miguel Sano at third base if Sano isn’t able to shape up for the role by Opening Day.