DUBAI, UNITED ARAB EMIRATES -- Twelve of the world's top middle-distance dirt horses representing a half-dozen racing nations will clash in Saturday's $12-million G1 Dubai World Cup at sprawling Meydan Racecourse in Dubai. The fields and post positions for the evening's four non-Group 1 races--including the Dubai Kahayla Classic for the Purebred Arabians--were announced Monday, while stalls for the five elite-level contests were allotted during a ceremony Wednesday evening emceed by Rishi Persad and Laura King at the Armani Hotel at the iconic Burj Khalifa in Central Dubai. Ushba Tesoro...