Northwest Stud's stallions played a prominent role on the popular Summit of Speed program at Gulfstream Park yesterday, beginning in the second race. First-time starter U S Diva, a 2-year-old by United States bred by Northwest, went wire-to-wire in the $65,000 maiden special at five furlongs, reporting home by 1 3/4 lengths under Jesus Rios. The filly owned by Sandra Trotter was sent off at 23-1 in her debut and paid $49.40, while earning a check for $42,000 . . . In the seventh race, the $75,000 Birdonthewire Stakes, Three Rules justified his 6/5 price and romped to a five-length victory in 1:04.50 for the 5 1/2 furlongs. The 2-year-old son of Gone Astray was boxed in on the rail until the top of the stretch, when Cornelio Velasquez slipped him through on the inside en route to the easy score worth $44,640 to Shade Tree Thoroughbreds. Three Rules is now 2-for-2 with earnings of $80,640 and appears to be a major player for the upcoming Florida Sire Stakes . . . One race later, Bullet Gone Astray, the stakes-winning son of Gone Astray who has proven to be a bargain considering his $15,000 purchase price at the 2015 OBS April sale, rallied from far back in the Gr. III, $150,000 Carry Back Stakes and finished third, collecting a check of $14,700 and raising his total to $152,810.