A pair of American-bred 3-year-olds are among a field of six entered for Sunday's Yau Ma Tei Plate, the season's first race restricted to 'griffins' going the 1000-meter trip down the straight course at Sha Tin Racecourse. A griffin is defined as a 2-year-old or 3-year-old horse which has been imported into Hong Kong without having raced previously. The better-fancied of the two colts, each trained by second-leading and BMW Hong Kong Derby-winning conditioner Francis Lui, is Sunny Star (Flatter), who was trading overnight as the 19-5 third choice. Bred...