SAN FRANCISCO -- Matt Duffy made the Giants' opening day roster in March merely hoping to get at-bats as a utility infielder. The impact he ended up making as a rookie was measurable -- and immeasurable.
His coaches and teammates were so impressed that they voted him the 2015 Willie Mac Award winner -- the first time in its 35-year history that the honor went to a rookie.Duffy stood on the field alongside former winners including Jack Clark, Darrell Evans, J.T. Snow, Bengie Molina and Shawon Dunston -- and Willie McCovey, of course -- and thanked his family, coaches, teammates and "all the coaches who taught me how to play the game the right way. They taught me if you put in the time and…