The funny thing about Rodriguez having something to prove is that in 2004 he was largely consistent with his own standards and probably turned in the best offensive/defensive season ever by a Yankees third baseman. The first thing to note is that Yankee Stadium is a much tougher hitter's park than Ameriquest Field in Arlington. The park formerly known as The Ballpark in Arlington gifts right-handed hitters with a lot of home runs. Yankee Stadium doesn't do much for hitters at all, other than giving a mild boost to left-handed home run hitters. Decades after the left field "Death Valley" has shrunken to what Bill James called "Life Support Valley," the ballpark in the Bronx is still a pitcher's best friend.
At home, Rodriguez hit a good-but-not-stunning .280/.365/.492. On the road he batted .293/.386/.534, which is what he had been doing in neutral parks all along. As a Ranger in 2003, he batted .282/.384/.577 on the road but bulked up to .314/.407/.652 at home. Yankee Stadium doesn't do that for anyone. It's the Joe DiMaggio story writ small.