TIMONIUM, MD - The Fasig-Tipton Midlantic Fall Yearlings Sale gained momentum throughout its first session Monday in Timonium, with a filly by Uncle Mo bringing the day's top price when selling for $320,000 to Legion Bloodstock. A total of 145 yearlings sold Monday for $3,947,200. The average was $27,222 and the median was $14,000. The buy-back rate was 18.5%. During last year's opening session, 149 horses grossed $4,577,300 for an average of $30,720 and a median of $20,000. The buy-back rate was 16.3%. Ten yearlings sold for six figures Monday,...