On New Year's Day in 2017 the Kansas City Chiefs won their regular-season finale, with Charcandrick West's two touchdown catches from Alex Smith leading the way over the San Diego Chargers.
The Chiefs won the AFC West title that day, taking a tiebreaker with the Oakland Raiders. From that day until Sunday night, the Chiefs held at least a share of first place in the AFC West every single day, according to ESPN Stats and Info.
When the Baltimore Ravens fell on Clyde Edwards-Helaire's fumble Sunday night to seal a win over the Chiefs, Kansas City's streak ended.