The following are highlights of a new Matt Serra interview from MMA Junkie Radio:

On retiring from MMA: "I know why it’s hard to walk away from the game. Trust me, I know."

On the excitement of winning in MMA: "That feeling – to know you’re never going to have that feeling again? Listen, man, when you have a good night, get a knockout, finish somebody – oh my God, it doesn’t matter anything that happens after that. That single moment, nothing can be wrong in the world. That’s where your head’s at. Cloud nine is an understatement."

Check out the complete appearance at MMAJunkie.com.