(All times local) THE FINAL FOUR At TD Banknorth Garden Boston Semifinals Sunday, April 2 North Carolina (33-1) vs. Maryland (32-4), 6 p.m. Duke (30-3) vs. LSU (31-3), 8 p.m. At TD Banknorth Garden Boston Championship Tuesday, April 4 Semifinal winners, 7:30 p.m.