Readers of last week's posting about pitchers who had plunked Craig Biggio for two different teams may have noticed that only one of them, Jay Witasick, has done so for both an American League and a National League team. Today's opponents, the Milwaukee Brewers, hold the distinction of being the only franchise to hit Craig Biggio with a pitch as a member of each league. Biggio was hit once in 13 career plate appearances against the Brewers when they were an AL team, but since the Brewers moved to the NL Central (including yesterday), they have hit him 15 times in 494 plate appearances - about once every 33 plate appearances. Overall, Brewers pitchers have increased there rate of hitting batters since moving to the NL. From 1970 to 1997, they faced 168,866 and hit 978 of them, plunking one out of every 172.7 batters on average. Since moving to the National League, from 1998 to 2005, they hit 468 of 50,847 batters, for an average of 1 plunk every 108.6 batters. Facing Craig Biggio so much more often can't quite account for all of this increase in the Brewers plunking frequency - taking him out of the equation, the Brewers have still hit 1 batter per 111.2 faced. Other factors might include the overall increase in hit batters league wide over the last decade, and the overall decrease in the Brewers talent level since they've been in the National League (though they do appear to be turning things around), but it's still very tempting to conclude that the presence of Craig Biggio on their schedule since moving to the National League somehow causes this increase in ways that stats can't fully explain.
(and yes, I've excluded the stats from the 1969 Seattle Pilots, mostly for my own convenience)