Zenyatta won the 300,000-dollar Clement L. Hirsch Stakes Thursday to improve to 18-0 Saturday. The 6-year-old mare, with jockey Mike Smith in the irons, defeated Rinterval in the 1 1/16-mile race. Zenyatta won the Hirsch for the third straight year. She was first by a head last year in the tightest finish of her career, while in 2008 she won by a length. It was her fourth Grade One victory of the year, to go with triumphs in the Vanity Handicap, the Apple Blossom on dirt at Arkansas' Oaklawn Park, and the Santa Margarita Handicap. Rinterval, under Rafael Bejarano, set the early pace as Zenyatta settled in next-to
