Washington center fielder Denard Span had surgery Monday to repair a right core muscle injury and will miss the Nationals' opener next month. Manager Matt Williams said the projected time for Span's return is uncertain and added "you're looking at four-to-six weeks before he can start doing baseball activity again." Read more http://espn.go.com/mlb/story/_/id/1...-core-muscle-miss-washington-nationals-opener
