Hideki Mitsui is headed to one of the world's most famous prisons, where the "Tokyo No. 1 Boss Dog" will try his hand at ruling the yard.

Mitsui survived an impromptu 3-point shootout against bj-league star Masayuki Kabaya and then beat good friend Tomoya "Worm" Ochiai to win the Japan final of the Red Bull King of the Rock one-on-one basketball tournament on Saturday afternoon.

"This is my first time playing in an event like this," Mitsui said. "I didn't really know how to go about things. I'm happy I was able to make it to the end and win."