2006-07 Boston Celtics
The year before they won the NBA championship, the Celtics endured a season of turmoil. Days before the opener, Red Auerbach died at age 89. Then, they lost their first seven games. Then All-Star Paul Pierce was lost to a stress reaction. And then the Celtics capped their worst stretch in franchise history -- an 18-game losing streak -- to finish with a 24-58 record.