UFC: BJ Penn Comes out of Retirement to Accept Challenge of Rory MacDonald

According to BJPenn.com and the official Twitter page of BJ Penn, he has decided to come out of retirement to square off with Rory MacDonald.

MacDonald has torn through tough competition like Nate Diaz, Mike Pyle and nearly defeated Carlos Condit. When he called out BJ Penn yesterday on MMAFighting.com's The MMA Hour, it seemed unlikely that anything would come from it.

The young welterweight was respectful in his request, and did not badmouth the former dual-division champion. 

"Right now I feel there’s a guy that I want to fight before he leaves the sport and that’s BJ Penn… He’s a legend and I think it’d be a really good matchup for me to have that fight in Toronto."

Penn surprisingly retired from the sport after a disappointing loss to Nick Diaz back in October. He has recently rejected the goading of Josh Koscheck, who attempted to call "The Prodigy" out on Twitter in May.

"

"@joshkoscheck I know it costs a lot of money to live that lavish lifestyle, big house, fast cars & you need big fights but sorry I’m not coming back anytime soon!" 

"

Did Penn have a quick change in heart? Or did simply not want to fight Koscheck? One thing is for sure, and that is the fact that MacDonald is a powerful welterweight who cannot be taken lightly.

Stay tuned to Bleacher Report for more on this story as it breaks.