SEATTLE MARINERS — Named Kristopher Negrón assistant to director of player development.
ATLANTA BRAVES — Agreed to terms with RHP Chris Martin on a two-year contract.
ROCKLAND BOULDERS — Traded INF John Brontsema to the Kansas City T-Bones of the American Association.
WASHINGTON WILD THINGS — Acquired 1B Josh Rehwaldt from the Sioux Falls Canaries of the American Association. Declined the 2020 contract options on OF Mick Fennell, INF Shaine Hughes, and LHP Josh LaPiana.
WINDY CITY THUNDERBOLTS — Released C Nate Montgomery, RHP Hayden Shenefield, and C Zach Taylor.