Observations on the European Racing Scene turns the spotlight on the best European races of the day, highlighting well-bred horses early in their careers, horses of note returning to action and young runners that achieved notable results in the sales ring. Monday's Observations features a seven-figure yearling. 2.48 Navan, Mdn, 3yo/up, c/g, 7f 180yT SHAFTESBURY AVENUE (Maxfield) may not have made much impact on his debut at The Curragh earlier this month, but Aidan O'Brien is renowned for improving his maidens exponentially and as a $1-million Keeneland September sensation is...