The Diamondbacks fired Bob Melvin on Thursday, hoping a new manager will be able to get the most out of their core of young players. The Diamondbacks said they will select Melvin?s replacement at a news conference on Friday afternoon, before they meet the Nationals in the opener of a homestand. ?This is a difficult decision, but I feel that our organization needs to move forward with a new voice,? GM Josh Byrnes said in a statement. Hitting coach Rick Schu also was fired, and pitching coach Bryan Price resigned.