Detrpot Lions RB Sione Vaki returns from injury, eyes bigger role

"Any opportunity I get to be out here, I want to show off my talents," said Detroit Lions running back Sione Vaki. Vaki is back on the field in training camp after breaking his nose in practice. Vaki has been a dependable player on special teams, but he wants to prove himself as an option to be the team's third running back in his third NFL season.