Edit: No, they're not fighting each other. I agree that would probably be more entertaining.
From Brian Knapp at Sherdog
Former UFC heavyweight champion Tim Sylvia will return to competitive duty when he meets Jason Riley in the Adrenaline MMA 4 main event on Sept. 18 at the Mid-America Center in Council Bluffs, Iowa.
In the Adrenaline MMA 4 co-main event, one-time UFC juggernaut Houston Alexander will lock horns with journeyman Sherman Pendergarst.
Alexander has not survived the first round in any of his past three fights, including an eight-second knockout loss to James Irvin.
Glad to see then both getting back in action