LEXINGTON, KY - The Keeneland September Yearling Sale opened its two-session Book 3 with a day of solid trade Friday in Lexington, with bloodstock agent Mike Ryan making the day's highest bid of $625,000 to acquire a colt by red-hot sire Into Mischief (hip 1614). In all, 200 yearlings grossed $21,803,500 during the session for an average of $109,018 and a median of $85,000. With 134 horses reported not sold, the buy-back rate remained elevated at 40.12%. The auction's cumulative buy-back rate stands at 39.72%. Last year's first Book 3...