10 Hardest Hitters in MMA History

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4. Shane Carwin

Photograph By Donald Miralle/Getty Images

Quitting time. That's what it's like to be hit by Carwin's supersized fists. When he touches people, they tend to implode. The stretch of five first-round punching KOs to begin his UFC run in 2008 (part of 12 straight opening-round wins overall), capped by Frank Mir getting cut in half, was devastating. Carwin's power drove him to the verge of the UFC heavyweight championship, yet the 37-year-old punched himself out against Brock Lesnar and was submitted.

Quintessential KO: Gabriel Gonzaga, March 7, 2009