Here at the one-third point of the season, the Nationals are still within spitting distance of .500, though they're slumping lately. Fans are wondering how long they can retain respectability. Here's my look at the Nationals' roster, ranked from most to least likely to significant drop off from their performance so far in the second two-thirds of the season. (Note: I started writing this post early last week, so some of the numbers are a couple days behind.)1. Ivan RodriguezPudge is putting up his best OBP and wOBA since he led the Tigers to the World Series in 2004. And yet his line-drive rate is the lowest of his career, he's hitting groundballs on a whopping 57% of balls in play, and yet his BABIP is .361. And even when he was a great player, he never took walk. He's also 38 and on...

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