The main reason for the New York Giants' stunning Super Bowl XLII upset over the previously undefeated New England Patriots isn't in the Pro Football Hall of Fame yet. Neither is Eli Manning. No defensive coordinator is more decorated than Steve Spagnuolo.

Spagnuolo had two stints working with the Giants and head coach Tom Coughlin, who did not make the HOF finalist cut this year.

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The Philadelphia Eagles’ Vic Fangio, 66, and the Kansas City Chiefs’ Steve Spagnuolo, 65, ran the No. 2 and No. 4 scoring defenses in the NFL this season, respectively. Their detail-oriented mindsets are evident in how their defenses and teams practice and play. Their approaches have helped create and maintain the cultures of their organizations.

In order for the Chiefs to three-peat Spagnuolo is going to have to have another great performance against the Philadelphia Eagles, who have Saquon Barkley and the number one scoring offense in the postseason.