When Brett Rogers (right) steps into the cage Saturday night against Fedor Emelianenko, he will be face to face with the most feared fighter in the world. Emelianenko is the mixed martial arts version of Mike Tyson in his prime – mysterious, ferocious and seemingly unbeatable. A victory by Rogers on national TV on CBS would be akin to Buster Douglas’ stunning knockout of Tyson in 1990, and the man who hails from one of the toughest housing projects in the country knows he’s viewed as that type of underdog. But it beats changing tires for a living. As late as April, Rogers worked at a Sam’s Club in Woodbury, Minn., changing tires to support his family. He has gone 10-0 with nine knockouts to earn a shot against the man simply known as Fedor.