The 2026 Knicks had +2200 odds to win the finals before round 1 started. That’s the lowest odds for a champion in NBA history.
Historical data can be seen here. https://www.covers.com/sportsoddshistory/nba-champs/
They also had the second lowest odds for a champion ever prior to the semis, second lowest ever prior to the conference finals, and fourth lowest ever prior to the finals.