Jake Peavy: 4.72 ERA for the Red Sox, 2.16 ERA for the Giants

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When the Giants acquired Jake Peavy from the Red Sox in late July expectations were minimal.

After all, he was a 33-year-old impending free agent whose raw stuff and results had both declined to the point that he posted a 4.72 ERA in 20 starts for the Red Sox this season and a 4.48 ERA in 30 starts for the Red Sox since they acquired him in the middle of last year.

So naturally Peavy has been great in San Francisco with a 2.16 ERA in 10 starts. That includes 7.2 innings of one-run ball against the Diamondbacks last night for Peavy’s seventh consecutive start allowing two runs or fewer. By comparison, he allowed two runs or fewer in three of his final 14 starts for the Red Sox.

What’s changed? Peavy’s strikeout rate is actually down slightly since the trade, but he’s sliced his walk rate from 3.3 to 1.8 per nine innings and most importantly the league/ballpark switch has helped the fly-ball pitcher stop serving up homers. He allowed 20 homers in 124 innings for the Red Sox compared to just two homers in 67 innings for the Giants.

And now he’s a month away from hitting the open market in search of what will surely be a much larger contract than it would have been before the trade.