In recent years, "The Prodigy" has been smashing lightweights in what is arguably his most competitive weight class.
The former lightweight and welterweight champion now, however, has decided to return to 170lbs. After losing his lightweight strap to Frank Edgar, Penn is taking some exciting fights in the heavier division.
First he knocked out rival Matt Hughes in less than a half-minute, and now he faces number one contender, Jon Fitch, at the Acer Arena in Australia this Saturday.
Fans are excited to see how the legendary fighter stacks up against the creme of the crop in the modern era's welterweight division. He may be a little undersized, but the fighting dynamo is more than a handful for any fighter on the planet.
Win or lose this weekend, these are the five matchups BJ Penn should take at welterweight (outside of GSP).