celtic - rangers Celtic Rangers is a huge rivalry I'll admit, but THE biggest rivalry in the world is the Derby Della Capitale, which is AS Roma (Roma) vs. SS Lazio (Lazio)
Argentina vs. Brazil.
soccer world cup......i guess
The biggest participant sport in the world is soccer
it is soccer
Soccer is one of the world's biggest sports.
FIFA World CUP
Soccer. The worlds biggest sport officially. The world plays soccer.