Kelly is adding a four-seam fastball to his repertoire, WEEI.com reports. "That'€™s what I was working on [Saturday]. It was coming out good," Kelly explained. "I never threw it. This is the first time trying it. I thought I would give it a try. It's harder. It gets on hitters quick." Kelly drew raves from hitters following a live batting-practice session Saturday. The right-hander has had some success in the majors, but has yet to do it consistently.