The contract begins with the 2018-19 season, running through the 2022-23 campaign, and gives Westbrook the biggest guaranteed contract in the National Basketball Association.
The extension gives Westbrook the biggest contract in National Basketball Association history, $233 million over six years when combined with his $28.5 million salary this season, according to Wojnarowski.
Westbrook had said he wanted to remain in Oklahoma City, but some mystery remained about why he had not signed it.
Russell Westbrook wanted to keep the pressure on the Thunder organization to push to win, or he would consider leaving after the season.
The Oklahoma City Thunder has signed guard Russell Westbrook to a multi-year contract extension, it was announced today by Thunder Executive Vice President and General Manager Sam Presti.
By signing for the Designated Player Veteran Extension, it allows for Westbrook to sign for 35 percent of the salary cap and five additional seasons. Westbrook's total salary of $235 million includes $205 million for the new extension and $28.5 million for his 2017-18 salary.
"Like I said before, man, this is a place I want to be", Westbrook said on Monday.
"We are extremely fortunate to have an athlete, competitor and person such as Russell wear the Thunder uniform". "I got that home game for the Rockets on Christmas Day and I am looking forward to them showing up and showing out!" The Thunder have given him the help he needs to get it done in the playoffs, and this will be the most fascinating season in their franchise's history.
Westbrook was selected fourth overall in the 2008 NBA Draft and has been named to six All-Star teams in his nine seasons. Westbrook signed a 10-year contract with Jordan Brand in September to become the face of the shoe giant.