RIYADH, SAUDI ARABIA - When Prince Bandar bin Khalid Al Faisal, the chairman of the Jockey Club of Saudi Arabia, first started talking publicly last summer about creating the world's richest horse race, King Abdulaziz Racetrack didn't even have a turf course. Half a year later, the Riyadh oval is poised to host a world-class day of racing. Saturday's card is highlighted by the $20-million Saudi Cup, but also includes the $2.5-million Longines Turf H., $1.5-million Saudia Sprint, $1-million Mohamed Yousef Naghi Motors Cup, and $1-million STC 1351 Turf Sprint....