Transactions BASEBALL Arizona (NL): Named Bob Gebhard assistant general manager, Mike Aldrete hitting coach, Carlos Tosca third base coach, and Brett Butler first base coach. Chicago (AL): Signed P Kevin Walker. Cleveland (AL): Signed P Bob Wickman. Los Angeles (NL): Signed manager Jim Tracy to a two-year contract extension. Minnesota (AL): Signed C Mike Redmond to a two-year contract. Pittsburgh (NL): ...