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Top 10 knockouts that ended a UFC career

By Nick Strickland

ATLANTA, GA - SEPTEMBER 6: Rashad Evans (black shorts) def. Chuck Liddell (blue shorts) - KO - 1:51 round 2 during UFC 88 at Philips Arena on September 6, 2008 in Atlanta, Georgia. (Photo by Josh Hedges/Zuffa LLC via Getty Images)
ATLANTA, GA - SEPTEMBER 6: Rashad Evans (black shorts) def. Chuck Liddell (blue shorts) - KO - 1:51 round 2 during UFC 88 at Philips Arena on September 6, 2008 in Atlanta, Georgia. (Photo by Josh Hedges/Zuffa LLC via Getty Images) /
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OKLAHOMA CITY, OK – JUNE 25: BJ Penn prepares for the second round to begin while facing Dennis Siver of Germany in their featherweight bout during the UFC Fight Night event at the Chesapeake Energy Arena on June 25, 2017 in Oklahoma City, Oklahoma. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)
OKLAHOMA CITY, OK – JUNE 25: BJ Penn prepares for the second round to begin while facing Dennis Siver of Germany in their featherweight bout during the UFC Fight Night event at the Chesapeake Energy Arena on June 25, 2017 in Oklahoma City, Oklahoma. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images) /

8. BJ Penn

BJ Penn was one of the greatest fighters that the world has ever seen. Another rare athlete who managed to capture two UFC titles in two different weight classes. The former lightweight and welterweight champion is in the Hall of Fame for a reason.

In his prime Penn destroyed any and all challenges that the UFC threw his way. Jens Pulver, Joe Stevenson, Sean Sherk, Kenny Florian and Diego Sanchez were all victims of the BJ Penn that gave fellow fighters nightmares.

If there is a perfect example of a fighter who should have stayed retired and not come back BJ would be that example. Things started to go South for the Hawaiian after he lost his title and the following rematch to Frankie Edgar.

He may have obliterated Matt Hughes but his fights with Nick Diaz and Rory MacDonald were ones that he should never have taken. The veteran should have retired after the Hughes win but instead took two severe beatings at the hands of Diaz and MacDonald. After the fight with Rory Penn did retire but the damage had been done.

Penn has since returned and fought three times, losing all three bouts, two by way stoppage. The third meeting with Frankie Edgar ended in a knockout loss and for some odd reason, a fight with young phenom Yair Rodriguez was offered and accepted. It ended in violent fashion thanks to a front kick.

The damage may be done but BJ Penn will never be forgotten.

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