But a closer examination of Cabrera's numbers suggests an alternate possibility: Performance-enhancing drugs haven't done much at all for his offense.
Yes, Melky's hitting .346, a full 62 points better than his career average. But everything else he's doing is in line with his usual performance. He's walking in seven percent of his plate appearances and striking out in 12 percent of them, which are the same figures he's had all his career. He's hitting line drives on 21.8 percent of his batted balls, only a slight uptick from his usual 19.7 percent mark. The 10.7 percent of his fly balls he's hitting for homers is in line with the 10.3 percent of his fly balls he hit for homers on the 2009 Yankees, back when he was supposedly a loser.
The only big spike for Cabrera came with his BABIP (batting average on balls in play). His career BABIP is .309, but he hit .332 on balls in play last year and .379 on balls in play this year. Good luck explains some of this, and we can explain even more by looking at Cabrera's underlying numbers.
Players who hit more ground balls will have higher BABIPs than players who hit more fly balls. (Derek Jeter, our modern BABIP champion, hits a bonkers 58 percent of his batted balls on the ground.) Cabrera hit more ground balls this year than last year, so his BABIP ticked up. As for the pre-2011 spike, Cabrera got faster after losing 20 pounds during the offseason. In 2011, he set career highs in infield hits—with 26—and bunt hits—with 8. Those balls would have been outs in past years, but because of his new physique they were hits in 2011. His BABIP and batting average increased accordingly.
This year's version of Melky is more or less last year's version of Melky, only with a different approach at the plate: more ground balls. And last year's Melky was more or less the same old Melky he had always been, just a little lighter on his feet. That transformation isn't outlandish for a player entering his prime, and it sure as hell isn't indicative of a player receiving a significant chemical boost.