You know that Halladay is only 14-14 against the Sox. Also he has a WHIP of 1.277 which his second highest against teams he has pitched against more than 20 games. 12-11 against the Rays but against the Orioles he is 20-4.
http://www.baseball-reference.com/players/split.cgi?n1=hallaro01&year=Career&t=p