The Pittsburgh Pirates have traded left-handed reliever Caleb Ferguson to the Seattle Mariners. The deal was first reported by MLB.com’s Mark Feinsand and others before being announced by the Pirates on Wednesday night. Pittsburgh acquired right-handed pitching prospect Jeter Martinez in a one-for-one deadline deal.

The Seattle Mariners option Jackson Kowar after activating Caleb Ferguson following a trade with the Yankees ahead of the deadline.

SEATTLE — The Seattle Mariners agreed to acquire left-handed reliever Caleb Ferguson from the Pittsburgh Pirates on Wednesday, giving their bullpen another arm as they make a playoff push, a person familiar with the deal told The Associated Press on Wednesday.