The Oklahoma City Thunder have traded James Harden to the Houston Rockets after not being able to agree to a contract extension with the guard.

The Rockets sent SG Kevin Martin, Jeremy Lamb and future draft considerations to the Thunder for Harden, sources told Y! Sports. Along with Harden, the Thunder will send Cole Aldridge, Lazar Hayward and Daequan Cook to the Rockets.

Houston also sent two 2013 first-round picks (from Dallas and Toronto) to Oklahoma City. The first-round picks have varying degrees of protection on them, but the one from Toronto is assured of being in the lottery.

Contract extension talks between the Thunder and Harden broke down, and Thunder general manger Sam Presti moved quickly to trade the guard. Harden rejected a four-year offer that would have paid him between $53 million to $54 million.

The Thunder are paying franchise stars Kevin Durant and Russell Westbrook maximum contracts. They also agreed to a four-year contract extension worth about $50 million with forward Serge Ibaka.

The trade breaks up the Thunder’s young core, which carried the franchise into the NBA Finals last year.

Harden, 23, averaged 16.8 points, 4.1 rebounds and 3.7 assists last season and was named the league’s Sixth Man of the Year.