It is a known fact that the Bear's/ Packer's rivalry is the fiercest rivalry in the NFL, but I'm not sure about all of sports.
They are the two oldest teams in the NFL.
The Rivalry between Green Bay Packers and and the Chicago Bears is the oldest NFL rivalry. As of 2011, it is 90 years old; the first meeting between the two teams was in 1921.
Cowboys VS Redskins
They were all rivalry games.
Subaru Impreza Wrx Sti vs Mitsubishi Evolution (Evo). This rivalry will never end.
The Celtics and Lakers if you go way back.
The best team in the nfl is the Pittsburgh steelers
Currently, they are not the best team in the NFL.
I only know one. All I know is that people say that the Colts and the Patriots have a Red Hot Rivalry
The # 1 best wide out in NFL is Sydney Rice. the # 2 best wide out in the NFL is Chad Ochocinco. the # 3 best wide out in the NFL is Brandon Marshall