Quiet Hour takes on a field of seven in Sunday's sixth race at Gulfstream Park, the one-mile Sand Dollar Stakes. Since Jan. 1, 2014, trainer Martin Wolfson is winning at a 31 percent clip when saddling a horse switching from sprint to route, for a return on investment of $4.73. Check out the Positive ROI report as part of DRF Plus. Sign up for DRF Plus here.