The NFL's undefeated teams kept it going in Week 4.
Only Chicago lost on Sunday, and the Dolphins fell in Monday's battle of 3-0 teams.
Five remain unbeaten - Kansas City, Denver, Seattle, New England and New Orleans.
There's no contests between undefeated teams in Week 5.
The 1972 Miami Dolphins continue watching. Probably wishing the 2013 Dolphins stayed undefeated a little longer.