BASEBALL American League * Chicago White Sox -- Recalled Sammy Sosa, outfielder, from Vancouver of the Pacific Coast League. Placed Mike Huff, outfielder, on the 15-day disabled list retroactive to Sunday, August 25.
National League * Chicago Cubs -- Activated Frank Castillo, pitcher, from the 15-day disabled list. Optioned Scott May, pitcher, to Iowa of the American Association.
BASKETBALL National Basketball Association * Detroit Pistons -- Signed Charles Thomas, Roy Marble, and Drexel DeVeaux, guards, and Mark Bradtke, forward-center.