From Comcast SportsNetOKLAHOMA CITY (AP) -- The Oklahoma City Thunder signed All-Star point guard Russell Westbrook to a multiyear contract extension on Thursday.Westbrook was set to become a restricted free agent at the end of the season, meaning the Thunder would have had to match any offer he received from another team. Instead, they locked him up with a new deal 15 games into this season. Terms were not disclosed.Oklahoma City has the best record in the Western Conference, with Westbrook averaging 20.5 points, 5.5 assists and 5.0 rebounds. He was chosen as an All-Star for the first time last season."We are thrilled to solidify Russell's future with the Thunder," general manager Sam Presti said in a statement. "Since we arrived in Oklahoma City, Russell's work ethic, persistence, character, and involvement in our community have helped us establish the standards that we are committed to on a day-to-day basis. He is a valued member of our organization and we look forward to his continued contributions on and off the floor."Westbrook made the All-NBA second team last season after averaging 21.9 points, 8.2 assists and1.9 steals -- ranking among the top 15 in the league in all three categories. The Thunder made it to the Western Conference finals last season, losing to the Dallas Mavericks.He scored a season-high 36 points in Oklahoma City's 105-102 loss at Washington on Wednesday night.The Thunder had an off day Thursday during a three-game East Coast road trip and Westbrook was not immediately available for comment. They play Saturday night at New Jersey and the team plans a news conference after returning to Oklahoma City.