![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)
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
BJ PENN - Eleven years ago today I had the honor of going to war with my friend and MMA legend Nick Diaz 🤝 #UFC137 | Facebook
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Photos: Nick Diaz defeats B.J. Penn at UFC 137 | Georgia Straight Vancouver's News & Entertainment Weekly
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B.J. Penn's Camp Reveals Why He's Lost Respect for Nick Diaz | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
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UFC 137 Results: Nick Diaz And B.J. Penn Bust Each Other Up, Cro Cop Gets A Big Country Send Off - MMA Nation
![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/HBFHED/ufc-fighters-nick-diaz-right-and-bj-penn-left-square-off-during-a-HBFHED.jpg)
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
![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)