The Washington Nationals placed closer Jonathan Papelbon on the 15-day disabled list on Tuesday with a right intercostal strain and reinstated reliever Matt Belisle following a rehabilitation assignment. Manager Dusty Baker said Papelbon injured a muscle between his ribs while the right-hander was warming up Sunday, when he pitched one inning against the Philadelphia Phillies. ''I just threw a pitch and felt something,'' Papelbon said. More...