Diamondbacks left-hander Zach Duke is expected to miss two months of action because of two fractured bones in his pitching hand. Duke was struck by a line drive off the bat of Colorado's Charlie Blackmon during the second inning Saturday night. "It was very sensitive in the area, but I'm kind of surprised there's two broken bones in there," he said. "I'm going to shoot for as short a recovery as possible. The bones will tell me how much time it's going to take. The doctor wanted me to have X-rays each week to keep track of how it's healing. I'm going to be optimistic for sure." Arizona general manager Kevin Towers expects to fill the opening in the back end of the team's rotation internally.