Ackley isn't in the lineup Monday against the Astros, Shannon Drayer of 710 AM ESPN Seattle reports. Ackley will sit out for the second straight contest, and the fact that Monday's game comes against a right-hander starter in Brad Peacock could spell trouble for the lefty-hitting Ackley's hold on the starting left field job. The Mariners outfield got a bit more crowded Monday with the activation of Michael Saunders (oblique) from the DL, and it's possible he could end up pushing the slumping Ackley out of an everyday role.