Dolphins' position battle: Running back

Training camp is just around the corner, and the Miami Dolphins enter the season with interesting roster battles.

This week ESPN.com’s Dolphins page takes a look at several key position battles to watch this summer. On Tuesday, we examine the competition at running back.

Position battle: Running back

Competitors: Lamar Miller and Knowshon Moreno

Analysis: The Dolphins did not get enough from Miller last year in his first season as a starter. Miller rushed for just 709 yards and two touchdowns while disappearing in many games. That led to Miami signing free-agent tailback Knowshon Moreno, who is coming off a career year with the AFC champion Denver Broncos. On paper, Moreno was expected to secure the starting job from Miller without much resistance. But that hasn’t been the case. Miller has been the better tailback in Miami this offseason and got first-team reps throughout in new offensive coordinator Bill Lazor's new scheme. Moreno arrived a bit out of shape and has been slowed by a knee injury that required surgery. Moreno will attempt to get back to 100 percent in training camp, but he has a lot of ground to make up before Week 1.

Walker’s pick: Miller