Just to make sure this is perfectly clear right up front: defensive statistics for the 2011 season are a long, long, looong way from being reliable. The sample size, 30-something games for all teams, is just way to small for the data to mean anything right now. That unreliability is part of the reason why none of the advanced metrics agree on the Yankees’ defensive performance.
The table above, screen cap’d from FanGraphs, shows the advanced defensive numbers for each American League team. I recommend clicking for a larger view, one that you can actually read. The Yankees are third in the league with a +8.6 UZR, meaning they’ve saved more than eight-and-a-half runs better than expected through 34 games. Aside from the outfielder’s arms (ARM), they’ve been better than average on double plays (DPR), at ranging for the ball (RngR), and when it comes to making errors (ErrR). With positive production in three of the four components, it’s no surprise their UZR ranks so high. Then why is their +3.9 UZR/150 just seventh in the league, right in the middle of the pack? It’s just a sample size issue, these numbers are very volatile right now.
John Dewan’s famed +/- system (DRS in the chart) says the Yankees are a dozen runs below average right now, fourth worst in the AL. Revised Zone Rating (RZR), which measures how many balls hit to a player’s zone were converted into outs, says the Yankees are the second best defensive club in the AL at .858. RZR is used in conjunction with Out of Zone Players (OOZ), which is the number of balls hit outside of a player’s zone that he turned into outs, but the Yankees are just sixth in the league in OOZ. DER is defensive efficiency ratio, and although it’s not in the chart, it’s easily calculated. It’s just 1-BABIP, telling you how many balls in play are converted into outs overall, regardless of where they’re hit. The Yankees are middle of the pack (ranking eighth in the AL, to be exact) at 0.716 DER.
Six different stats (though it’s really four since UZR and UZR/150 go together, as do RZR and OOZ) giving us five different approximations about the team’s overall defense. Some say it’s great, others say it’s terrible, others say it’s middle of pack. But like I said before, it’s just way too early in the season for these numbers to have any meaning. So the question to you is this: what is your take on the Yankees’ overall defense this year? Is it good, bad, average, or something else? I think it’s been slightly better than average mostly thanks to Brett Gardner, Curtis Granderson, Robinson Cano, Mark Teixeira, and Russell Martin (who’s reminded everyone what defense behind the plate actually looks like), but that’s just me. What about you?