Jerry Remy's right near Fenway Park at 1265 Boylston Street is a good place to watch a game. Lots of TVs and it's very big so you can get a seat no problem and get your own TV changed to the game. -
http://jerryremys.com/fenway/
Cask 'n Flagon right next to Fenway Park at 62 Brookline Avenue has plenty of TVs and is close to Brookline also -
http://www.casknflagon.com/
Champions Sports Bar at 110 Huntington Avenue in the Back Bay is a decent sports bar with good beer and lots of TVs -
http://championsboston.com/
McGreevy's at 911 Boylston Street in the Back Bay also has lots of TVs. They call themselves a sports bar but it's more of an Irish Pub to me. -
http://www.mcgreevysboston.com/
There are a bunch of places near the TD Garden like The Fours and Boston Beer Works, both on Canal Street, if you want to venture down there.
Since it's on ESPN2 and the Bruins and Celtics aren't playing I don't see how you'll have any problem convincing them to put the UConn game on.