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There isn't anything like a good sporting rivalry to get your blood boiling.
It doesn't matter what sport you support, what part of the world you live in or what economic class you belong to – sporting rivalries cross all borders.
Here's our list of some of the most notable sporting rivalries.
Football – Manchester United v Manchester City
Cricket – India v Pakistan and England v Australia
Tennis – Federer v Nadal
Baseball – New York Yankees v Boston Red Sox
Basketball – Los Angeles Lakers v Boston Celtics
Ice Hockey – Russia v U.S. v Canada
Athletics – Haile Gabreslaisse v Kenenisa Bekele
We'd like to know what you think.
What are some of your favorite sporting rivalries? Why do you think sporting rivalries exist? How much do things like geographic location, economic class and history play into who you support?
Please leave your comments below.