>From today's Herald Red Sox blog. This is me feeling vindicated for contending 
>Jason Bay was not the lousy outfielder we were all told he was in the 
>off-season:

-- Matt
UZR owes Jason Bay an apology
This slipped through the cracks, but the good folks at FanGraphs — who are 
constantly tweaking their formulas in an effort to make them as accurate as 
possible — recently tackled what many within the game considered one of the 
biggest flaws of UZR, or Ultimate Zone Rating, which was treated as Gospel this 
winter during all the discussions of defense around these parts.
That flaw was UZR’s inability to handle quirky parks like Fenway, where left 
field and center field are of such strange configurations, they cannot be 
judged with a cookie cutter model.
It turns out that Mitchel Lichtman, the creator of UZR, agreed, so he augmented 
his model to better gauge things like left field at Fenway, or right field in 
Minnesota, or the entire outfield at Coors, as the FanGraphs people explain.
The upshot of these changes is that most players were relatively unaffected. 
However — and this is a big however — one player had his UZR significantly 
altered by the fixes, which were retroactively applied to old data: Jason Bay.
The former Red Sox outfielder, who was killed all winter for his horrendous 
defense (which was part of the justification for letting him sign a free agent 
deal with the Mets) saw his UZR shift from minus-13.8 runs to plus-1.9. Bay’s 
play in 2009 obviously didn’t change. Only the numbers did. And the new numbers 
say Bay was not horribly below average last year, but in fact saved the Red Sox 
a couple of runs in left.
It wouldn’t have made a difference as far as the Red Sox re-signing Bay — we 
now know that was an impossibility once their deal collapsed at the All-Star 
break over his medicals — but it would have at least changed the narrative. 
Maybe fans and media members wouldn’t have been so quick to give up on the 
biggest bat in the lineup if they hadn’t been able to lean on the “he can’t 
play defense” crutch

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