4 Man Draw: Federer, Nadal, Djokovic and a Wild Card.
Before each tournament: write the names of ALL the other pro players on a separate sheet of paper and stick them in a jar. Pick one. This player would be the Wild Card (i.e. sacrificial lamb).
Granted the ATP probably won't embrace my idea because it would prevent them from selling overpriced tickets to matches that don't matter, but still, think of all the time we could save.
