Seattle Mariners Director of Player Development Andy McKay has set the Opening Day rosters for the four full-season Minor League affiliates.

The Tacoma Rainiers (AAA), Arkansas Travelers (AA), Modesto Nuts (High-A) and West Virginia Power (A) open their seasons on Thursday, April 4, as part of Minor League Opening Day. The Mariners remaining affiliates Everett AquaSox (short-season A), Arizona League Mariners (rookie) and Dominican Summer League Mariners open their seasons in June.