MIAMI - South Florida's winter racing season gets off to a hot start, only not at Gulfstream Park, as one might expect, but across town at Calder with Saturday's Grand Slam II program. The 12-race card features four stakes, three of which are graded, including the $200,000 W.L. McKnight Handicap and its filly counterpart, the $200,000 La Prevoyante Handicap.