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Brooks earned just $4 million during the past two seasons while the Thunder rose quickly from the team that started 1-12 in 2008-09 in the franchise's first season in Oklahoma City into the ranks of title contention.
ESPN The Magazine's Ric Bucher reported earlier Friday that the Thunder originally offered him a three-year extension worth between $11 million and $12 million before this past season began. In the wake of this season's trip to the NBA Finals, Bucher reported, Oklahoma City recently increased the offer to roughly four years for $16 million.
Miami Heat coach Erik Spoelstra made $3 million this year, sources told Bucher. Rick Carlisle of the Dallas Mavericks, meanwhile, recently signed an extension that netted him only a $100,000 raise -- from $4.5 million to $4.6 million -- in the first year of the new deal after guiding the Mavericks to their first championship in franchise history in 2011.
NBA coaching sources have said for weeks that both the Portland Trail Blazers and Orlando Magic had Brooks high on their respective lists had the Thunder decided not to bring the 46-year-old back.
ESPN The Magazine's Ric Bucher and The Associated Press contributed to this report.