Trainer Aidan O'Brien sends a well-credentialed trio-including G1 Irish Derby hero Santiago (Ire) (Authorized {Ire})-to the G1 Pertemps St Leger S. at Doncaster on Saturday. Third in the G1 Al Shaqab Goodwood Cup S., the bay is joined by Irish Derby third Dawn Patrol (Ire) (Galileo {Ire}) and G1 Criterium de Saint-Cloud third Mythical (Fr) (Camelot {GB}). Another Galileo colt, Irish Derby runner-up Tiger Moth (Ire), will contest the Sept. 13 Grand Prix de Paris in France or closer to home, Leopardstown's G3 Kilternan S. the day prior. "We're going...