Miami's Liberty City is football's Mecca, home to NFL legends. But the biggest rivalry in this city isn't exactly big--it all starts with a hard-hitting squad of 6 year-olds.

Boca and River may be the most infamous rivals in the world of soccer, but today, Argentina's most legendary game is known less for the battle on the field than the anarchy off it.

On most days Florence is overrun by tourists, but once each year, the locals reclaim their city through an ancient game where the roots run deep and the blood flows freely.

Biggest rivalry in Australian football is marked by broken jaws, foul mouths and phallic tattoos.

The story of teammate-turned-enemy in the world of E-sports.

Buried deep in the Appalachian hills, an old grudge between two fading towns lives on through a basketball rivalry at the lowest level of the minor leagues.

In a nation defined by religious and political rivalry, the game between Lebanon's two best basketball clubs is no exception.

Algeria is home to North Africa's biggest soccer derby; this all-consuming rivalry is rooted not in hate, but the same love for the game that forged their country through revolution.

As farms dry up in Montana and people disappear, two schools that were once bitter rivals must join forces to give hope to two fading towns.