From Kincsem to Zenyatta: 13 Mares Who Made Racing History
Who are the greatest female racehorses of all time? Kincsem — 54-for-54, still the longest undefeated career by a Thoroughbred racehorse and the clearest No. 1 on record alone Ruffian — 10-for-10, one of the most brilliant American fillies ever produced and still the emotional benchmark for greatness Zenyatta — 19 wins from 20 starts …