Peyton Manning has challenged the young receivers on the Colts to step up as the team's third option. "Every one of those guys, I've told them, 'There's a receiver's spot open right now,' " Manning said last week. Indianapolis has nine receivers, but no clear third behind Reggie Wayne and Anthony Gonzalez. The other seven receivers have combined for five catches and zero touchdowns. Five have never played in a regular-season game.