The Seahawks and 49ers have been in the same division for just 11 years. The two teams hadn't made concurrent playoff appearances until last season.
But while nascent, their rivalry is considered by some to already be the best in the NFL.
After 49ers coach Jim Harbaugh fanned the flames earlier this week with comments about the Seahawks' string of PED-related suspensions, Danny O'Neil and Tom Wassell spent part of Friday's show discussing where that rivalry ranks compared to some that have more history behind them.
They share their thoughts in the video below.
You can listen to Friday's show here.