In light of Jason Bay’s recent hot streak — he’s hitting .307/.374/.466 over the last month — and two homerun game last night, some fans are beginning to wonder if the pre-Mets version of Jason Bay is finally beginning to show up. After all, Bay had posted above a .385 wOBA in four of the five seasons prior to signing with the Mets; his bat can’t disappear overnight, can it? Considering that Bay has now played 155 games with the Mets, take a look at how his line compares with the average for the rest of his career:

When you look at his numbers in this light, his problem becomes immediately obvious: his power has completely evaporated. He’s still walking at a similar rate (10-11%), striking out at a similar rate (25%), hitting around 90 singles per 600 PA, making contact with a similar number of pitches (75%), and having balls fall in for hits at around his career average rate (.320 BABIP). Literally the only difference between the Old Bay (mmm!) and New Bay is his utter lack of power: his homerun total has plummeted, dragging his batting average down, and he’s also hitting fewer doubles. While Bay used to be good for 30+ homerun per season, the Mets have only gotten a total of 43 extra base hits out of him so far.
This conclusion leads me to two important questions: how much is Citi Field to blame for Bay’s loss of power, and is Bay’s recent surge a sign of good things to come?
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