Agree he is a good baserunner and probably has above average speed. A deep fly to right at Fenway would allow Sandy Leon to score from 3B, maybe on one leg. But not Daniel Nava who, I swear, one time did not advance from 2B on a drive off the wall in right to right center field at Fenway. In fact, at the moment it hit the wall, he was sliding--yes, sliding--back to 2b.