Buffalo Bills: This isn't exactly a battle, but coach Doug Marrone made it clear that C.J. Spiller would be a clear No. 1 back over Fred Jackson. Spiller will no longer come off the field in the red zone. There is an expectation that Marrone will run the ball plenty, so it sure sounds like Spiller's usage will go up.
Denver Broncos: With Willis McGahee gone, it's a three-way battle between Ronnie Hillman, rookie Monte Ball and veteran Knowshon Moreno. A local Denver paper suggested Hillman is the favorite to be a Week 1 starter, but that's hard to imagine. He is a classic third-down back; executive John Elway has said as much. Ball should be the guy, with Moreno hanging around if things go poorly for the rookie.
New York Jets: Running backs are much easier to evaluate when pads come on, but we didn't hear anything to dispute the line of thinking that offseason acquisition Chris Ivory will step into a top role. Bilal Powell could challenge Mike Goodson for the third-down back role. Fourth-stringer Joe McKnight, meanwhile, only is talking to the media on designated days. We'll miss the Rex Ryan era.
Bell has a good chance to rack up touches as a rookie, but he has to prove he can pass protect in training camp.
San Diego Chargers: This isn't a battle as much as a situation. The Chargers want Ryan Mathews to take a step forward this season, but he's going to have far fewer snaps even when he's healthy. Danny Woodhead fully is expected to take over third-down duties after a standout offseason. Mathews has struggled in pass protection.