You are still IN. Your last pick (Day 10) was Djokovic over Verdasco. Your Del Potro pick hasn't been used, as I explained all QF matches count as one day (Day 10). You are allowed to pick Del Potro for Day 11 or 12 if you want.
EDIT: Just to make it clear, your Day11 pick is Nadal if you don't post different before deadline.
So I'm definately dead now
But thanks for running the game so well and efficiently. Good luck to all remaining players.