The San Francisco 49ers fell to 2-8 outside the NFC West with their 34-7 defeat to San Diego on Thursday night.
The NFC West now has a 12-23 record against teams from other divisions.
No division has fewer non-division victories this season.
The St. Louis Rams have an NFC West-leading 4-5 record outside the division.
A quick look at how each NFC West team has fared outside the division:
St. Louis (4-5): Beat Washington, San Diego, Carolina and Denver. Lost to New Orleans, Oakland, Tampa Bay, Detroit and Atlanta.
Seattle (3-5): Beat San Diego, Carolina, Chicago. Lost to New York Giants, Denver, Oakland, New Orleans and Kansas City.
Arizona (3-5): Beat Oakland, New Orleans and Denver. Lost to Atlanta, San Diego, Tampa Bay, Minnesota and Kansas City.
San Francisco (2-8): Beat Oakland and Denver. Lost to New Orleans, Kansas City, Atlanta, Philadelphia, Carolina, Tampa Bay, Green Bay and San Diego.
The chart breaks down the records overall and by division.