Baseball Boston Red Sox -- Signed CF Ellis Burks (.296, 21 HRs, 89 RBI) to one-year contract for $1.825 million to avoid arbitration hearing. Burks had asked for $2.1 million when he filed for arbitration; team offered $1.35 million.

Pittsburgh Pirates -- Won arbitration case with RF Bobby Bonilla (.280, 32, 120), who will make $2.4 million in 1991 instead of $3.475 million.

Seattle Mariners -- Signed P Rich DeLucia (1-2, 2.00 ERA) and P Brent Knackert (1-1, 6.51) to one-year contracts.

Texas Rangers -- Signed RF Ruben Sierra (.280, 16, 97) to one-year contract for $2.625 million to avoid arbitration hearing. Sierra had asked for $3.1 million when he filed for arbitration; team offered $2 million.

Basketball

New Jersey Nets -- Activated C Sam Bowie from injured list.

Placed G Kurk Lee (rookie from Towson State) on injured list.