Bob Melvin wasted no time making changes to his A's coaching staff after receiving a new three-year deal last week to stay as manager. The A's said Friday they aren't renewing the contracts of bench coach Joel Skinner, pitching coach Ron Romanick and hitting coach Gerald Perry. First base coach Tye Waller and third base coach Mike Gallego will return to the staff in 2012. Bullpen coach Rick Rodriguez will be considered a candidate for his same position next year.