Shams: Hartenstein agrees to three-year extension with Thunder, total existing contract now five years, $134 million.

According to Shams, the Oklahoma City Thunder's Isaiah Hartenstein plans to sign a new three-year contract, keeping him with the team through the 2028-29 season. His total guaranteed salary over five years with the franchise reaches $134 million. This signing in 2024 became a key acquisition that fueled the team's rise in 2025.

Hartenstein and his CAA agency team (Andrew Morrison, Aaron Mintz) reached an agreement with the Thunder: an additional $75 million in new salary over the next three years, with a trade bonus of up to 15% attached to the contract. The deal also includes a special mutual option allowing both sides to renegotiate contract terms.

Isaiah Hartenstein, born May 5, 1998, holds dual U.S. and German citizenship. Standing 7'0" (213 cm) and weighing 250 lbs (113 kg), he plays center and currently suits up for the Oklahoma City Thunder. Selected with the 43rd overall pick in the second round of the 2017 draft by the Houston Rockets, he spent his early career bouncing between the Nuggets, Cavaliers, Clippers, and Knicks, often on the fringes of the league.

In 2024, Hartenstein signed with the Thunder and quickly secured the starting center role, becoming a core piece in the team's resurgence. This season, he averaged 9.2 points, 9.4 rebounds, and 3.5 assists while shooting an efficient 62.2% from the field, with elite interior finishing. He excels at positioning, rebounding, and passing, capable of protecting the rim against physical bigs while also delivering sharp short-range passes — making him an ideal playmaking center in modern small-ball systems. His physical toughness and aggressive offensive rebounding have made him a defensive anchor in the Thunder's paint.

From a drifting second-round afterthought to a starting big man on a championship contender, Hartenstein has completed his rise through solid defense, elite rebounding, and passing skills. He lacks outside three-point shooting but has firmly established himself through interior scoring off feeds, pick-and-roll finishing, and high-post facilitation. Now a cornerstone of the Thunder's frontcourt, he fortifies the paint defense as the team chases a title.