Mason ran for 765 yards on 179 rushes ( 4.3 avg . ) with four rushing touchdowns and one receiving touchdown .
Running back Tre Mason led St. Louis in rushing as a rookie last year .
Tre Mason ran for 765 yards on 179 rushes ( 4.3 avg . ) with four rushing touchdowns and one receiving touchdown .
Running back Tre Mason led St. Louis in rushing as a rookie last year .