Those numbers fail to take many clutch, truly game-breaking things into account that WPA type stats include. Double plays are much worse than creating one out, but are not taken into account. How many runners were on base? Was it the third out? What was the exact situation? A-Rod could have hit a solo HR in the 9th while down by 3 runs, and it would give him the same 'close and late OPS' score as somebody hitting a grand slam down by 3 runs in the same situation. Obviously, those two outcomes have drastically different effects on improving the chances of winning a game during a clutch situation. edit: Also, this stat compares their "clutch" performance to "context neutral" performance. So, the fact that Rodriguez suffers a dramatic dropoff in numbers during clutch situations hurts him. On the other hand, Lopez is not nearly as good normally, but has performed much better in at-bats that were more influential in determining the outcome of the game.