Vernon Davis has been matched up against Manny Lawson since both players were in college. Michael Crabtree and Joshua Morgan have been going against Nate Clements since the young receivers joined the San Francisco 49ers.
Those competitive matchups will take on a whole new dimension Sunday when the 49ers play the Cincinnati Bengals.
Lawson and Clements were key defensive starters for San Francisco the past four seasons but now both have similar roles with the Bengals. They'll be looking for an edge Sunday against the same receiving threats they had been practicing against for years.
And so will the 49ers lined up across from them.