6. Jacque Vaughn
It’s fair to say that Vaughn didn’t cast much of a spell on the Orlando Magic. He’s officially the worst coach in the history of the franchise. When the Magic hired him, they were in a rebuilding phase. However, they didn’t plan on him knocking the whole building down.

They won just 15 out of 52 games before the Magic finally lost patience with him. It included a 10-game losing streak and multiple five-game losing streaks. Now he’s working as an assistant coach with the Brooklyn Nets. There’s time on his side to try again with another franchise in the future.