The 50 Dirtiest Athletes in Sports History Vincent Pugliese/USA TODAY Sports

30. James Harrison

Sport: Football
Career: 2002-Present
Dirty Highlights

Harrison racked up $145,000 in fines for illegal hits in 2010. The linebacker even considered retirement because he felt he was being singled out by the league. However, Harrison quickly came to his senses and put retirement rumors to rest days later. Yup, those helmet-to-helmet hits haven't caused that kinda brain damage...yet.

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