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10 Biggest Upsets in Sports History

Underdogs Get Their Day

By Cassidy Taylor, XFINITY Sports

American sports history is full of heartbreak, triumph, and surprises. Some of the best moments occur when absolutely no one expects them.

These have proven that it’s not always talent that wins, that sometimes it's the size of the fight in the dog that produces the biggest upsets in sports history. (AP Photos)

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