No. 6 seed Xavier beats third-seeded Pittsburgh 71-68 in second round of men's NCAA tournament.   Top-seeded Duke beats eighth-seeded California 68-53 in second round of NCAA tournament.   NCAA: Xavier-Pittsburgh in final minute   Woods: He's 'nervous' about reception at Masters   Thousands call for immigration reform in DC   Health care demonstrators gather outside Capitol   Israel: No building restrictions in east Jerusalem   NCAA: Xavier extends lead against Pittsburgh   NCAA: Texas A&M leads Purdue 32-25 at half   Immigration activists rally for change   Flood fears recede in Fargo as river hits crest   NCAA: Duke leads California 37-24 at half   NCAA: Lucas likely tore left Achilles' tendon   NCAA: A game of one-on-one-upmanship   Greenberg sells AIG stock to UBS for $278 million   AL MVP Joe Mauer agrees to a $184 million contract extension with the Twins.   French left beats Sarkozy's party in regional vote   AP Sources: Two Woods interviews to air Sunday   Obama order on abortion locks in health care votes   Thousands rally for immigration reform in DC