DEL MAR, Calif. — Sensational mare Zenyatta improved her record to 12-0 with a narrow victory in yesterday’s Clement L. Hirsch Stakes at Del Mar.

She ran four horses wide into the stretch and rallied to win by a head under strong urging from Hall of Fame jockey Mike Smith.

Zenyatta ($2.40) covered 1 1/16 miles in 1:43.24.