Based on opponents' winning percentage in 2013, the Oakland Raiders have the most difficult schedule in the NFL.

The Raiders play in the AFC West, which had three playoff teams in the Denver Broncos, Kansas City Chiefs and San Diego Chargers. The AFC West also plays the NFC West in inter-conference games this season.

The Broncos, St. Louis Rams, Chargers, San Francisco 49ers, Seattle Seahawks, Chiefs, Arizona Cardinals, New York Jets and New England Patriots round out the top-10.

The Indianapolis Colts have the easiest schedule in the NFL, largely due to the weakness of the AFC South.