What is the greatest sports rivalry of all time in your opinion?

I'd say both Rangers/celtic as it's still going strong and Ali/Frazier as the most classic duel.

lets go with the patriots vs giants 07 and 2012

and in nascar since no body talks about it lets go gordon and johnson 06 the yr in which gordon was screwed over by the new points system

The biggest ones are in european football by far,either at a club level or national teams,none of those in the poll even comes remotely close.

The Cardinals and Cubs because we don't beat the shit out of each and send opposing fans to the hospital because they like a different sports team. I moved to LA right before the Cards advanced to the NLCS. I was petrified of walking into Dodger Stadium after hearing all the awful stories about their violent fans. I stayed home.

Yankees vs the Sox is probably the most publicly recognized rivalry to date, also think Giants vs Jets should be up there.

University of Florida vs. Florida State, if you live down here you gotta pick a side at birth lol.

Toronto Maple Leafs vs. Montreal Canadiens for sure.

Celtic vs Rangers
Manchester United vs Liverpool
Spurs vs Arsenal
Inter vs AC Milan
Schalke vs Dortmund
Barcelona vs Real Madrid
Roma vs Lazio

LOL. Hooliganism and ultras are TWO DIFFERENT things. And beside that: You have to defend your team, city and club colours.