Hialeah Park launches its fourth season of Quarter Horse racing on Saturday with trials for two of its richest races of the meet. Saturday’s eight-race card, which begins at 2 p.m. Eastern, will feature four trials apiece for the $100,000 Hialeah Derby, a 440-yard race for 3-year-olds, and the $100,000 Hialeah Lassie Futurity, a 400-yard race for 2-year-old fillies. Both finals, along with the $100,000 Hialeah Laddie Futurity for colts and geldings, will be part of the South Florida Quarter Horse Festival on Dec. 30. The 36-day meet will feature live racing Friday through Sunday until Feb. 17. A total of 24 stakes are scheduled, most worth $20,000. In addition to the three stakes on Dec. 30, the other $100,000 race is the South Florida Quarter Horse Derby for 3-year-olds going 440 yards on closing day. Hialeah plans to open a casino with 870 slot machines and 21 poker tables during the summer of 2013. The track first opened in 1925, but has not held any Thoroughbred races since 2001.