LEXINGTON, Ky. – Pachattack was good enough to run third in the Breeders’ Cup Ladies’ Classic last fall, but that’s not the scary part. What makes the 6-year-old Pachattack such a major threat to win the Doubledogdare Stakes on Friday at Keeneland is the way she performs over Polytrack, as witnessed by her six-length romp last spring in the Grade 3 Arlington Matron and a sharp runner-up finish in the Grade 1 Spinster here last fall.