Handicappers will have a tough time tossing many horses from their tickets as a competitive nine-horse field lines up for Saturday's six-furlong GI Bing Crosby S. at Del Mar, a "Win and You're In" qualifier for the GI Breeders' Cup Sprint. Given a slight nod on the morning line at 5-2 is C Z Rocket (City Zip). Claimed for $40,000 last spring at Oaklawn by Peter Miller, the gelding has been a new horse since, winning seven of nine races while finishing second in the other two. That streak includes...