The first-place New York Yankees concluded a three-game sweep of the Washington Nationals on Sunday at Nationals Park. Washington's offense was stagnant. The young team made mistakes. Three winnable games resulted in three losses. But with the team still leading the National League East, none of that is cause for alarm just yet.

What was eating Nationals Manager Davey Johnson after his team's 4-1, series-closing loss was the state of his cornerstone third baseman, Ryan Zimmerman, and his continued struggles at the plate. Zimmerman's 0-for-4 performance dropped his batting average to .229.