The Utah Jazz hold the record, having strung together 19 straight winning campaigns from 1985-86 to 2003-04.
Utah's record-setting streak, while still impressive, yielded just two NBA Finals appearances and zero championships.
The Jazz, led by the legendary duo of John Stockton and Karl Malone, finished with a sub-.600 winning percentage seven times during the streak, including the first three and last three seasons.
On the other side of the coin, San Antonio has four championships and five Finals appearances during its streak, with the opportunity to pad that total this season.
To this point, the Spurs' lowest winning percentage during the run came in 2009-10, when they finished 50-32 for a still-strong .610 winning percentage.
Sitting at 43-16 heading into Tuesday's game in Cleveland, this season's Spurs hold a .729 winning percentage and are in no danger of falling below the .600 mark.
While they haven't received the media attention afforded to other top Western Conference teams, the Spurs are actually a bit ahead of last season's 58-win pace, currently on track for 60 wins.
It's clear that San Antonio's current run is more impressive than the one that Utah put together from 1985-86 to 2003-04, and it may just be a matter of time before the Spurs best the Jazz's record. Even with Tim Duncan, Tony Parker and Manu Ginobili growing old, it's hard to imagine the Spurs finishing below .500 any time in the near future.