The Oklahoma City Thunder have strengthened their championship core by agreeing to a three-year, $75 million contract extension with center Isaiah Hartenstein, ensuring the veteran big man remains in Oklahoma City through the 2028-29 NBA season.
According to reports, the new agreement adds $75 million in fresh money and increases Hartenstein’s total guaranteed earnings with the Thunder to $134 million over five years. The contract also includes a 15% trade kicker and a rare mutual option after the 2027-28 season, giving both the player and the franchise additional flexibility in the future.
Hartenstein originally joined Oklahoma City as a free agent in 2024 and quickly established himself as one of the NBA’s premier defensive centers. His rebounding, interior defense, passing ability, and physical presence played a major role in helping the Thunder capture the 2025 NBA Championship, while he continued to be a key contributor during the 2025-26 campaign.
Last season, injuries limited the 28-year-old to 47 regular-season games, but he still averaged 9.2 points, 9.4 rebounds, and 3.5 assists per game. Despite missing time, Hartenstein remained one of Oklahoma City’s most reliable postseason performers and an important piece alongside stars Shai Gilgeous-Alexander, Chet Holmgren, and Jalen Williams.
The extension also reflects Oklahoma City’s commitment to maintaining its championship-caliber roster while carefully managing salary-cap challenges. The Thunder have already made several cost-cutting moves this offseason, including trading Isaiah Joe and Aaron Wiggins, as the franchise attempts to remain competitive while navigating the NBA’s luxury tax and second-apron restrictions.
By securing Hartenstein on a long-term deal, the Thunder retain one of the league’s top defensive big men and preserve the continuity of a roster expected to compete for another NBA title in the 2026-27 season. With their core largely intact, Oklahoma City continues to position itself as one of the strongest contenders in the Western Conference.
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