For me its my driver. If I cant put the ball in play, im doomed. I went through a spell where I couldnt get off the tee, so much so that it left me with a billion yards for a 2nd shot. I relied heavily on wedges and putter. I got really good with those clubs. If my driver is on, I can go low (low 70s) if it isn't, im high 70s-mid 80s