Unleashing her trademark heart-stopping rally, Zenyatta nailed graded winner St. Trinians in the final strides to win the Grade I Vanity Handicap at Hollywood Park on Sunday, remaining undefeated in 17 starts.

The win gives Zenyatta the modern record for the longest win streak against top level competition not restricted to state-breds. Triple Crown winner Citation, Puerto Rican standout Mister Frisky and two-time Horse of the Year Cigar all won 16 consecutive races. Citation's streak was accomplished from 1948-50, Mister Frisky's from 1989-90 and Cigar's from 1994-96.

Since her career debut on Nov. 22, 2007, Zenyatta's streak has now lasted just shy of 31 months. The streak includes 11 Grade I victories - including the 2008 Breeders' Cup Ladies Classic and the 2009 Breeders' Cup Classic - and four Grade II wins. Zenyatta has won on four tracks - although 15 of her starts have come at the three majors tracks on the California circuit, she has also shipped to Oaklawn Park to win two editions of the Grade I Apple Blossom on the track's conventional dirt surface.

A stone-cold closer, the 6-year-old daughter of Street Cry was unhurried out of the gate in Sunday's Vanity, trailing the other five mares in the field as longshots Cherryblossommiss and Miss Silver Brook set an honest pace. Zenyatta, with regular rider Mike Smith up, began to make up ground on her own leaving the backside, but as usual was forced to circle the field, going widest of all turning for home.

Meanwhile, St Trinians, winner of the Grade II Santa Maria earlier this year over Breeders' Cup Ladies Classic winner Life Is Sweet, took the lead at the top of the stretch. Carrying 120 pounds to highweight Zenyatta's 129, St. Trinians held a 2 1/2 length lead with a furlong to go. Under urging from Smith, Zenyatta rallied furiously in the final strides to get up and beat St. Trinians by a half length, stopping the clock in 1:49.01 for nine furlongs.