Lone Star Park and Sam Houston will both have afternoon cards Saturday to complement the simulcast of the Preakness. Lone Star will start at 1:35 p.m. Central, while Sam Houston will get its Quarter Horse action underway at 1 p.m. Central.  Sam Houston has a pair of notable stakes Saturday, the Grade 3, $70,020 Texas Juvenile Challenge and the $55,260 Texas Derby Challenge. The winners of the races earn berths into the respective Grade 2, $130,000 Juvenile Challenge Championship and Grade 3, $180,000 Derby Challenge Championship, both Oct. 14 at Prairie Meadows.  Sam Houston closes out its Quarter Horse meet Monday. :: Enjoy news and analysis from DRF? Get handicapping analysis, real-time coverage, special reports, and charts. Unlock access with DRF Plus. * Will Rogers Downs near Tulsa will close out its Thoroughbred meet on Saturday. The track is putting on a 10-race card led by a pair of allowances for horses bred in Oklahoma.    * Champion Strawberry Silk, winner of the 1989 All American Futurity, died Sunday in Oklahoma, according to a press release from Ruidoso Downs. She was 30.