What will be the most competitive position battle when training camp begins in late July?
The cornerback competition.
How do we know this? Well, there are two pieces of evidence that validate the claim.
For one, there are no incumbent starters at the position. Last season’s first-stringers Perrish Cox and Chris Culliver are now with the Tennessee Titans and Washington Redskins, respectively. It's worth noting that Tramaine Brock would have been a starter had he not gotten against the Cowboys in Week 1.
Secondly, San Francisco 49ers defensive backs coach Tim Lewis said he’s never had a position group with more competition from top to bottom.