In the NBA, greatness is often measured in championships. Michael Jordan is considered to be so great because he won six rings. Kobe Bryant won five. Even LeBron James, who has three rings to date, vaulted upward on the list of greatest players once he held the Larry O’Brien trophy. People will always remember the truly great teams, as well. But sometimes, teams that aren’t so great sometimes end up winning the championship — even when they have a great player or two on the roster. Here are the 15 worst NBA teams to win the title.