Donaire vs. Nishioka October 13 In Carson, California

The Super Powers of the junior featherweight and the junior welterweight divisions will do more than flex their muscles when they battle for supremacy, mano a mano, in a sensational night of championship boxing.

Top-Five pound for pound fighter and four-division world champion Nonito “Filipino Flash” Donaire will risk his junior featherweight world title against fellow super bantamweight champion Toshiaki Nishioka.

And in the second main event, former world lightweight champion Brandon “Bam Bam” Rios will take on No. 1 contender “Mile High” Mike Alvarado where undefeated records and world rankings will be at risk.

These four gladiators boast a combined record of 131-5-4 (86 KOs) -- a winning percentage of 94% with 2/3 of those victories coming by way of knockout.

Information on tickets, including prices and on-sale date, will be announced soon.

"History shows there is only one way for a fighter to make the leap to stardom and that’s by accepting the challenges and risks like the ones Donaire, Nishioka, Rios and Alvarado committed to on October 13. They are young, hungry and ambitious," said Todd duBoef, president of Top Rank.

“Fight fans everywhere will be marking their calendars for October 13 to see this superb, all-action doubleheader on our late-night franchise,” said Kery Davis, senior vice president of programming, HBO Sports.

The ticket prices and on-sale date for the Donaire vs. Nishioka / Rios-Alvarado championship fight event will be announced soon.

Promoted by Top Rank, in association with Teiken Promotions, the Donaire vs. Nishioka / Rios-Alvarado championship doubleheader will take place Saturday, October 13 under the stars at The Home Depot Center in Carson, Calif. Both fights will be televised Live on HBO Boxing After Dark, beginning at 10 p.m. ET/PT, delayed on the West Coast.