03/08/2012 08:10 am ET Updated Mar 08, 2012

LeBron James, Serena Williams & The 25 Biggest Sore Losers in Sports History

Nobody likes to lose, and in all honesty, it is difficult to always be the most gracious loser.

But, there is also a line that should never be crossed.

This is the line between amateur and professional, child and adult—this is the line that no professional athlete should cross.

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