It's not a secret that Utley's being platooned, and why. He's a career .200 against lefties with about a .550 OPS. This year he's hitting .118 against them.
While Polanco's in Philly, he ain't starting against lefties, period. The way he hits them, you dont want to be playing him against lefties.
He'll get a shot when Polanco's traded, but even then he's going to have to start producing against them.