Pan the camera away from Saratoga and Del Mar, where the glamorous juveniles debut one after another, and focus for a moment on two lower-profile tracks that hosted two eye-popping performances this weekend. On Saturday at Prairie Meadows, Tyler's Tribe, a 2-year-old Iowa-bred gelding by Sharp Azteca (Freud), won the 5 1/2-furlong Iowa Stallion Futurity by 12 1/2 lengths in 1:04:18 to remain undefeated in three starts. He earned a 90 Beyer Speed Figure--you read that correctly--for the easy score. It wasn't a fluke, either, because in his previous start...