Atfter months of circling around each other, world champions and Bay Area rivals, Frank Shamrock and undefeated Cung Le will finally face off in the cage when Shamrock defends his Strikeforce World Middleweight (185-pound limit) Championship against Le in the main event of an eagerly anticipated EliteXC-Strikeforce co-promoted mixed martial arts extravaganza at the HP Pavilion in San Jose, Calif.