![Nick Diaz, right, punches BJ Penn during UFC 137 at the Mandalay Events Center in Las Vegas, Nevada on Saturday, October 29, 2011. Photo by Francis Specker Stock Photo - Alamy Nick Diaz, right, punches BJ Penn during UFC 137 at the Mandalay Events Center in Las Vegas, Nevada on Saturday, October 29, 2011. Photo by Francis Specker Stock Photo - Alamy](https://c8.alamy.com/comp/HBFH25/nick-diaz-right-punches-bj-penn-during-ufc-137-at-the-mandalay-events-HBFH25.jpg)
Nick Diaz, right, punches BJ Penn during UFC 137 at the Mandalay Events Center in Las Vegas, Nevada on Saturday, October 29, 2011. Photo by Francis Specker Stock Photo - Alamy
![Nick Diaz, left, taunts BJ Penn during UFC 137 at the Mandalay Events Center in Las Vegas, Nevada on Saturday, October 29, 2011. Photo by Francis Specker Stock Photo - Alamy Nick Diaz, left, taunts BJ Penn during UFC 137 at the Mandalay Events Center in Las Vegas, Nevada on Saturday, October 29, 2011. Photo by Francis Specker Stock Photo - Alamy](https://c8.alamy.com/comp/HBFH1G/nick-diaz-left-taunts-bj-penn-during-ufc-137-at-the-mandalay-events-HBFH1G.jpg)
Nick Diaz, left, taunts BJ Penn during UFC 137 at the Mandalay Events Center in Las Vegas, Nevada on Saturday, October 29, 2011. Photo by Francis Specker Stock Photo - Alamy
Fight Week Flashback: Nick Diaz vs BJ Penn | Nick Diaz's return is just weeks away! Flashback to his UFC 137 showdown with BJ Penn | By UFC | Facebook
![Photos: Nick Diaz defeats B.J. Penn at UFC 137 | Georgia Straight Vancouver's News & Entertainment Weekly Photos: Nick Diaz defeats B.J. Penn at UFC 137 | Georgia Straight Vancouver's News & Entertainment Weekly](https://www.straight.com/files/v3/styles/gs_standard/public/2012/10/BJPenn_NickDiaz_UFC_2011.jpg?itok=LbmEAmDI)
Photos: Nick Diaz defeats B.J. Penn at UFC 137 | Georgia Straight Vancouver's News & Entertainment Weekly
![UFC fighters Nick Diaz, right, and BJ Penn, left, square off during a weigh-in for UFC 137 in Las Vegas, Nevada on Friday, October 28, 2011. Photo by Francis Specker Stock Photo - Alamy UFC fighters Nick Diaz, right, and BJ Penn, left, square off during a weigh-in for UFC 137 in Las Vegas, Nevada on Friday, October 28, 2011. Photo by Francis Specker Stock Photo - Alamy](https://c8.alamy.com/comp/HBFHGG/ufc-fighters-nick-diaz-right-and-bj-penn-left-square-off-during-a-HBFHGG.jpg)