The Steelers and the Colts.
The University of Michigan - Ann Arbor since 1990
New England Patriots
The team that has the best record or has the best season record.
The University of Kentucky Wildcats has the best winning record in NCAA history, with a 1876-577-1 record since 1903.
The best team in baseball with a record was the 2001 Mariners
The MLB team that has the best record in baseball since the All-Star break in 2010 is the New York Yankees. They have had a record of 56-32. They have also scored the most runs since the break with 469.
In each league, the team with the best record normally plays the Wild Card team. The exception is that if the team with the best record and the Wild Card team are from the same division, then the team with the best record plays the division winner with the worst record.