Colts running back Trent Richardson got off to a good start in the preseason opener, barreling eight yards up the middle on his first carry against the Jets. But he finished with 13 yards on five carries, an average of 2.6 yards per carry.
Richardson averaged 2.9 yards per carry last season. He gave way Thursday to Dan Herron, who served as the No. 2 back with Ahmad Bradshaw sitting out.