With Saturday's G1 Pertemps St Leger attracting a dozen runners and Frankie Dettori booked for Ballydoyle's G1 Irish Derby hero Santiago (Ire) (Authorized {Ire}), Doncaster's action has its customary focus but before that is a card on Friday that features races at the extremes. In the G2 Bombardier Flying Childers S., 2-year-olds will be flying over five furlongs before the older stayers get their chance to shine in the G2 bet365 Doncaster Cup over almost two and a quarter miles. Such is the rich diversity of the meeting and although...