The Washington Nationals have placed catcher Wilson Ramos on the 15-day disabled list with a right hamstring injury and called up catcher Sandy Leon from Triple-A Syracuse. The Nationals announced the move before Wednesday night's game at San Francisco. Manager Matt Williams says an MRI on Ramos revealed a Grade-1 hamstring strain. See more http://espn.go.com/mlb/story/_/id/11069111/washington-nationals-put-wilson-ramos-dl-hamstring-injury