1973 Philadelphia 76ers
The Philadelphia 76ers lost their initial 15 games during the 1972 to 1973 season. But their misfortunes did not stop there. In the same season they went on a 20 game losing streak. This was the new record during that time. They set another record for the worst percentage in a full regular season at 0.110 percent. You would think it stops there but it does not. They ended with a 9-73 record, which was the most number of losses ever.