Detroit Tigers second baseman Josh Harrison (hamstring) and shortstop Jordy Mercer (quadriceps) will both head to Dallas on Monday to visit with Dr. Daniel E. Cooper. Mercer was getting close to a return but suffered a setback on his rehab assignment this week. There is no timetable for either player's return at this point. Fantasy owners won't be missing them while they're out, either, as neither middle infielder was doing much at the plate before their injuries. Detroit will mix and match up[...]