When the Nationals traded a top pitching prospect to Minnesota for center fielder Denard Span, it signaled a shift in their approach. The team wanted to improve their outfield defense and get a more traditional leadoff hitter to set the table. In Wednesday’s win over the Marlins, just his second game with the team, Span gave visible proof of both dimensions. He got on base, four times in fact, and in a variety of ways. He hit a double in the third inning, drew two walks - something he showcased in spring training – and even reached on a bizarre fielder’s choice.