Defensive standout guard Cason Wallace has agreed to a five-year contract extension with the Oklahoma City Thunder worth $139million.

Wallace, who was slated to become a restricted free agent following this season, led the league with 150 steals in 2025-26 and was selected to the NBA All-Defensive Second Team.

The 22-year-old averaged career highs with 8.6 points and 2.6 assists while appearing in 77 games, including a personal-best 58 starts.

Wallace was selected by the Dallas Mavericks with the No. 10 pick in the 2023 NBA Draft before being traded to Oklahoma City for 12th overall selection Dereck Lively II.

Wallace’s 346 steals since his 2023-24 rookie season rank third-most in the NBA.

Just in: Oklahoma City Thunder All-Defensive guard Cason Wallace has agreed to a five-year, $139 million rookie-scale contract extension, agents Jeff Schwartz, Max Lipsett and Marcus Monk of Excel Sports Management tell ESPN. https://t.co/vCNVSJjp0q

— Shams Charania (@ShamsCharania) October 19, 2026