22. 2017-18 Houston Rockets
The Rockets have a curious history. They were the first NBA franchise to make the Finals with a losing record. 1986 saw them become the lowest-ever seeded team to win the title. So when they post the best regular-season results in history you’d think they’d win.
Sadly for Rockets fans, that’s not what happened. With an overall record of 65-17, they were in title contention. With James Harden leading the way anything seemed possible. But they lost out to the Golden State Warriors in the Conference Finals and are still seeking a title in the modern era.