New York Mets -- Signed P Hipolito Pena to a minor-league contact and assigned him to Triple A Tidewater.
Oakland Athletics -- Activated P Dave Stewart from the 15-day DL. Placed P Goose Gossage on the 15-day DL, retroactive to July 19.
Pittsburgh Pirates -- Placed P Zane Smith on 15-day DL. Unconditionally released former Orioles P Jeff Robinson and P Jerry Don Gleaton. Purchased contract of P Paul Wagner of Double-A Carolina and P Steve Cooke and P Blas Minor from Triple-A Buffalo.