NEW YORK (AP) _ The baseball players' association filed a grievance Thursday claiming the Baltimore Orioles improperly terminated the contract of pitcher Sidney Ponson.

The Orioles released Ponson and voided the remainder of his three-year contract on Sept. 1, a week after he was arrested for driving under the influence of alcohol.

Ponson was making $7.5 million this season under a $22.5 million, three-year contract, meaning he was still owed about $1.3 million. He was due to be paid $10 million next year, with $3 million of his 2006 salary deferred and scheduled to be paid in equal installments on June 1, 2007, and June 1, 2008.

The union claims the Orioles didn't have just cause for their actions. Unless settled, the case will be heard by arbitrator Shyam Das.