B-R has an additional split which is kind of interesting. It shows the hitter's numbers for games started by a LH or RH pitcher. Meaning that it also includes any PA's against relievers of the other handedness in that game.
In games started by a lefty this year Beni has an OPS of .756 - not great but not horrible.
One could argue that this just means you don't bring him into those games unless there's an RH reliever. But it's not always such a simple matter to pinch hit as you please during a game.