Today's top sports stories:

David "Captain America" Wright, who had been on fire during the World Baseball Classic (10 RBIs), was a last-minute scratch before Team USA's loss to the Dominican Republic on Thursday night. His injured rib cage looks like it will keep him out for the remainder of the tournament. [Star-Ledger]

More action today in the NFL's free-agent market, including Danny Woodhead signing with San Diego, Dustin Keller moving to Miami and much more. [USA Today]

Rafael Nadal defeated Roger Federer on Thursday, 6-4, 6-2, to advance to the semifinals of the BNP Paribas Open. Both players are coping with nagging injuries, which took some of the shine off the renewed rivalry. [ESPN]

In the second round of the Big Ten Tournament, Wisconsin upset No. 6 Michigan, 68-59, behind 16 points from Traevon Jackson. [S.I.]

Points leader Jimmie Johnson and Brad Keselowski are set to face off this weekend at the Food City 500 at the Bristol Motor Speedway. Get a preview of the action here. [GuySpeed]