The NBA and its players union appointed Roger Kaplan as their new grievance arbitrator, the league said.

Kaplan, a Washington-based labor arbitrator, replaces John Feerick, the Fordham University law school dean who presided over such high-profile matters as the Latrell Sprewell grievance.

The NBA fired Feerick, and either the union or the league can fire Kaplan. The new arbitrator will serve an indefinite term.

Kaplan has heard salary arbitration cases in baseball and disputes between NFL players and their agents.

* MOVES: The Warriors, looking for some outside shooting help in the midst of a losing streak, signed free agent G-F Sam Mack to a contract.

Terms of the deal were not disclosed.

The 6-foot-7 Mack played in 44 games last season with Houston and Vancouver, averaging 10.7 points. He made 87 three-pointers last year, ranking eighth in the league. He also led both the Rockets and Grizzlies in free throw shooting percentage. . . . The Rockets signed F Anthony Miller to a 10-day contract, and the Cavaliers signed 6-9 F Kornel David to a 10-day contract. . . . Toronto C Alek Radojevic, selected 12th in the 1999 NBA draft, underwent surgery for a bulging disk in his back. He is expected to be out four to six weeks. The 7-foot-3 Serb has appeared in one game, playing one minute in the Raptors' season opener against Boston in November.