18. 2015-16 San Antonio Spurs
The Spurs had the best regular season in their history when they won the Southwest Division title in 2015-16. They did this with a record of 67-15, but one achievement stands out above them all. They tied the 1985-86 Boston Celtics’ record of 40 home wins in a season. Meanwhile, their 67 wins were a franchise record.
While they did crash out in the Conference semifinals to the Oklahoma City Thunder, they were great throughout the season. It also marked the end of the Tim Duncan era, as he retired after 19 seasons with the Spurs. They made the playoffs in every one of those years.