After another dominating performance, this time in the Iowa Cradle S., the undefeated Iowa-bred gelding Tyler's Tribe (Sharp Azteca) will face the stiffest test of his career when going next in the GI Breeders' Cup Juvenile Turf Sprint at Keeneland. Just don't call him an underdog. He's too fast for that. "We're headed to Kentucky and I think we have a good horse," said co-owner and trainer Tim Martin. "I know he's been running in Iowa but has been beating them pretty bad over there. He's been pretty amazing." The...