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I came up with slightly different numbers, FWIW. Cannon blocked Watt on 29 plays by my count, and was one on one with him on 13 of them. Of those 13, 9 were runs or quick passes that went the other way, where Cannon's job was essentially to momentarily get in the way. That's not to diminish Cannon, Watt is notorious for moving around the line to always fine the most favorable matchup, and if I was McDaniels I'd do the exact same thing. I would be very hesitant to ask
anyone to contain Watt one on one for more than a second or two.
Based on that, I think it's overstating it to say that Cannon kicked Watt's ass or anything, but he did hold up very well. I'd say he outplayed Watt, even. Here's the 4 plays where he was put on an island against Watt and was asked to make a play:
Great job here, doesn't give up the edge.
Watt tries to bull rush him, but Cannon handles it well.
This is the one play that Watt made on Cannon - shed the block and made the tackle.
Cannon does a nice job steering Watt outside here.
Also, he wasn't one on one here, but I do want to highlight this since it was Cannon's best play of the day, and either this or Blount's 9 yard TD run against the Dolphins is his best of the season:
All in all, I'd say Cannon got the better of Watt. The Pats' gameplan was clearly centered around stopping Watt at all costs, and that meant a lot of double teams, some triple teams, and a lot of runs / quick passes to the other side. But when they did ask him to make a on one one play he was mostly up to the task. Weirdly enough, his negative plays in this game were mostly given up to other defenders: 2 to Reader, 1 to Clowney, 1 to Bullough. Makes sense, since these plays occurred when Watt shifted over to the left side of the formation, and naturally the offense's attention shifted that way too.