The Mariners signed veteran backstop Andrew Knizner to a one-year major league deal, according to a report from the Seattle Times' Adam Jude. Mariners announce they have signed Andrew Knizner (KIZZ-ner) to a one-year MLB deal. He’ll serve as Cal Raleigh’s backup. https://t.co/UBv0541m7Z

As they look to fill the void left by Jorge Polanco’s departure, the Mariners are engaged in trade conversations to add a proven major league hitter, sources say.