Ian Mahinmi: 4 years, $64 million (2016)
Heading into the summer of 2016, it was no secret that the Washington Wizards cleared up enough room for a maximum contract, with the hopes of bringing Kevin Durant — a Washington, D.C.-area native — back home. But Durant spurned the Wizards, leaving them with a ton of salary cap space, and nothing to do with it.
Instead of managing it wisely and saving it for later, they went out and inexplicably threw $64 million at Ian Mahinmi, who averaged 5.1 points and 4.3 rebounds over the prior eight years. After arriving in Washington, Mahinmi has never averaged more than 6 points or 5 rebounds over the course of an entire season.