NASHVILLE, Tenn. — Tennessee returner Marc Mariani has broken his left leg at the end of a punt return in the first quarter against the Arizona Cardinals.Replay showed his leg snapping near the calf as he went to the ground at the end of 14-yard return with 9:40 left in the first quarter Thursday night. He remained on the ground for several minutes as a team doctor put an air cast around his lower leg. He w ...