UNLV Running Rebels
The largest margin of victory was 30 pts in a champtionship game. Not sure about just tournament games.
Super Bowl XXIV
45
52
In 1963, Loyola set the NCAA tournament record for largest margin of victory (69 points) with a 111-42 victory over Tennessee Tech in the first round.
In 1939 European Basketball championship Lithuania defeated Finland by a margin of 103 points (112:9), in 1953 Eurobasket tournament USSR won against Denmark by 104 points (118:14).
The 1940 National Football League Championship Game, December 8, 1940, Bears 73, Redskins 0.
52-2
I'm pretty sure UNLV beat Duke by 30pts in the 1990 title game
7
The largest margin of victory in an NFL game was 73 by the Chicago Bears in the 1940 NFL Championship game. The Bears beat the Redskins 73-0.
The largest margin of victory recorded in a horse race was by Secretariat in the Belmont Stakes in 1973, where he won by 31 lengths.