WATKINS GLEN, N.Y. — As the reigning Sprint Cup champion, Brad Keselowski's photo holding the coveted series trophy is on the cover of the media guide NASCAR hands out at races. The venues change, the photo doesn't, a constant reminder of a great season. With four races remaining until the Chase for the Sprint Cup title begins, Keselowski is back in position to defend, and that has to make both NASCAR and team owner Roger Penske awfully happy.