Does BABIP Stand For ‘Being A Baller In Philadelphia’?

I love calculating lesser-known baseball statistics just because. I know what you’re thinking: “Pump the brakes, bro, they’re just numbers.” Point taken. The truth is I never took a single statistics course in school but I know this much: while baseball statistics aren’t solely intended to predict future performance, they can provide a glimpse into developing trends.

There is an advanced baseball statistic called BABIP. It stands for batting average on balls in play. Once a batter puts a ball in play, there are many different outcomes: a ground ball to the left or right, a line drive to left, center, or right field, a fly ball to left, center, or right field, pop up in the infield, the ball could hit a base runner, and so on. Critics of BABIP say it’s unfair to penalize the pitcher when he doesn’t have much control over what happens once the ball is put in play (unless, of course, he actually fields the ball himself).

With that bit of background, I’ll first touch on the BABIP formula and then discuss where, traditionally, pitchers have a distinct BABIP advantage. Lastly, since I’m also a Phillies fan, I’ll put the Phillies relievers under the microscope with regard to their early-season BABIPs and tell you if there’s cause for concern.

First, let’s get geeky. The key variable in the BABIP formula is obviously “balls in play.” Home runs aren’t actually in play so they’re out (no pun intended) and won’t count against the pitcher. Walks don’t count as an official at-bat so they won’t count against the pitcher either. Strikeouts, like home runs, don’t involve a ball in play, but sacrifice flies are technically in play though not an official at-bat. So here’s how to calculate a pitcher’s BABIP:

  1. Subtract home runs from total hits
  2. Subtract strikeouts and home runs from the total at bats and add the number of sacrifice flies
  3. Divide the total from #1 by the total from #2 to get the BABIP

BABIP was once thought to be a random statistic, grounded more in defense and luck than in skill. For example, Pitcher A and Pitcher B are both left handed, both have around a 4.00 ERA, both have modest strikeout percentages, and both field their position the same. Pitcher A has Gold Glove shortstop Jimmy Rollins behind him while Pitcher B has James Rolland, a minor league shortstop call-up with poor range, behind him. Chances are Pitcher A and his BABIP will benefit from having Rollins behind him, whereas Pitcher B may surrender more infield singles because Rolland has worse range, a worse glove, a worse arm or a little of each.

Further studies, though, have refuted BABIP as a random statistic. A study conducted by between 1995 and 2008 shows that the home team pitcher has a distinct BABIP advantage.

So what exactly is a good BABIP? Is it below 4.00, like a good ERA for a starting pitcher or below 2.00, like a good ERA for a relief pitcher? Not exactly. A good baseline BABIP is somewhere between .290 and .300. According to, through games played on April 11th, Phillies relievers have the second-worst BABIP in baseball (.368) behind the Yankees (.412). I calculated the Phillies’ relievers BABIP myself and got a slightly higher number (.379). Going back to the formula, here’s how I arrived at that number:

  • Subtract 3 home runs from 28 hits to get 25
  • Subtract 29 strikeouts and 3 home runs from 97 at-bats to get 65
  • Add one sacrifice fly to 65
  • Divide 25 by 66 to get .3787

I’m still not sure where the discrepancy is but it’s pretty bad either way.

To break that down even further, here’s a table that shows BABIP stats by Phillies’ reliever:

Chad Durbin 4 3.1 0.455 66.70% 18.20% 0.00% 8.10
Jeremy Horst* 4 5.1 0.438 50.00% 31.30% 0.00% 6.75
Raul Valdes 3 5.2 0.421 56.60% 35.00% 11.10% 9.53
Jonathan Papelbon 3 3.0 0.333 62.50% 42.90% 33.30% 6.00
Mike Adams 4 3.1 0.250 100.00% 20.00% 33.30% 2.70
Phillippe Aumont** 2 2.0 0.250 100.00% 75.00% 0.00% 0.00
Antonio Bastardo 3 3.0 0.125 100.00% 50.00% 0.00% 0.00

Since the study highlighted a BABIP pattern which favored the home team’s pitcher, I took that as a challenge. I wanted to see if the current Phillies’ relievers’ career BABIPs were, in fact, better at home than on the road and here’s what I found:

2013 BABIP Career BABIP Home Career BABIP Away
Chad Durbin 0.455 0.284 0.302
Jeremy Horst* 0.438 0.352 0.239
Raul Valdes 0.421 0.289 0.321
Jonathan Papelbon 0.333 0.295 0.262
Mike Adams 0.250 0.253 0.267
Phillippe Aumont** 0.250 0.125 0.381
Antonio Bastardo 0.125 0.257 0.277

* Has pitched in 48 career games
** Has pitched in 20 career games

The fact that Jeremy Horst has a career home BABIP more than one-tenth of a point worse than his career road BABIP, in my opinion, is an aberration due to park factor. In 2011, he pitched the first 12 games of his career at Great American Ballpark in Cincinnati, which, according to ESPN, slightly favored pitchers. He pitched 32 games in Citizens Bank Park in 2012, which, according to ESPN, also slightly favored pitchers. So you would think that his home BABIP would be slightly better than his road BABIP. Keep in mind I did not take home runs into consideration when looking at how Horst was affected by park factor, since BABIP does not factor home runs into its formula. In reality I think Horst’s small sample size has skewed his numbers and, in order to get a more accurate BABIP number, he needs more games under his belt.

Jonathan Papelbon’s higher career home BABIP makes perfect sense to me. He’s a career flyball pitcher (771 fly balls / 1,265 ground balls and fly balls = 60.9%) who pitched in Fenway Park from 2005 – 2011. Fenway Park’s park factor favored the hitter in every year except 2005 and 2009. Flyball pitchers generally have an advantage with regard to BABIP for the same reason I mentioned above. Pitchers who allow more fly balls than others will surrender more home runs as well. But this won’t count against them since they’re not calculated in the BABIP formula. As will be the case with Papelbon and pitchers of his ilk, K% and K/9 are excellent secondary statistics to use to gauge a relief pitcher’s effectiveness. In his career as a reliever, Pap owns a career 30.2 strikeout percentage and 10.92 K/9 rate. Not too shabby.

What does this all mean besides the fact that I had some free time on my hands?

BABIP is a complex baseball statistic that can provide insight into how your favorite player or team is faring in this particular category. As far as the Phillies’ relievers are concerned, while it may be too early to predict future success of the squad based on their BABIP right now, it’s a safe bet that most if not all of them will regress to their career mean by the end of the season.

Where the Phils will be in the standings at that point is anyone’s guess.

5 thoughts on “Does BABIP Stand For ‘Being A Baller In Philadelphia’?

  1. Anonymous

    Until today, if someone were to have asked me, “What’s ‘BABIP’?” I would have guessed it’s a remote location somewhere west of East Jabip. Very interesting!


  2. nbernstein

    I learned a lot about this arcane baseball statistic and found it very interesting. But I have a few follow up questions that maybe you can answer. First, why do you only talk about relief pitchers BAPIPs? Second, what is the relationship between a team’s BABIP (or their relievers’ and/ or pitching staff’s BABIPs) and their standings?
    Great blog!!


    1. section426 Post author

      Thanks for your comment.

      The reason why I focused on relief pitchers is because through games played on April 11th, I had noticed that Phillies relievers had a penchant for … well, for lack of a better word … sucking. Through the bullpen’s 25.2 innings pitched to that point, they had collectively given up 16 earned runs, and that’s not including inherited runners they allowed to score. For example, in the April 3 game against the Braves, Roy Halladay left the game after recording one out in the fourth inning and Andrelton Simmons was on first base. Reliever Raul Valdes subsequently allowed Simmons to score but that run wasn’t charged to Valdes. It was charged to Halladay.

      Regarding a correlation between a team’s BABIP and their standings, of the 10 teams that qualified for the postseason last year, only 3 pitching staffs (Baltimore Orioles, Washington Nationals, and Oakland A’s) ranked in the top 10 for the overall best (see lowest) BABIPs allowed. Breaking top BABIPs down by starting pitching, the Atlanta Braves, San Francisco Giants, Nationals, and Orioles were in the top 10 and by relief pitching, the A’s, Nationals, and Orioles were in the top 10.


  3. Pingback: Better Gauge Players’ Value To Avoid Overpaying | Section 426

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