Short version: Watson decimates the Champs. Here's how. [Thanks, once again, to Rashad8821 at YouTube.]
Watson keeps beating them to the buzzer so consistently often that you have to wonder if the text of the question reaches Watson somehow faster than it does the human contestants. Interestingly, however, with full 30 seconds at its disposal, it gets the final question completely wrong -- When did Toronto become a US city? [For an explanation how Watson might have been confused by the clue, read this post at IBM's Smarter Planet blog].