Thirteen proved to be the luckiest of numbers for Zenyatta whose latest victory improved her record to 13-0 and moved her into rare company in horse racing history.The stellar mare's win in the Group One Lady's Secret Stakes on Saturday at Santa Anita tied filly Personal Ensign's streak of 13 consecutive wins set from 1986-88.Personal Ensign retired as the first undefeated champion in American racing in more than 80 years.Ridden by Hall of Fame jockey Mike Smith, Zenyatta covered the 1-1-16 mile

Thirteen proved to be the luckiest of numbers for Zenyatta whose latest victory improved her record to 13-0 and moved her into rare company in horse racing history.

The stellar mare's win in the Group One Lady's Secret Stakes on Saturday at Santa Anita tied filly Personal Ensign's streak of 13 consecutive wins set from 1986-88.

Personal Ensign retired as the first undefeated champion in American racing in more than 80 years.

Ridden by Hall of Fame jockey Mike Smith, Zenyatta covered the 1-1-16 miles (1700m) on the synthetic Pro-Ride surface in 1:42.89.

"It's a once-in-a-lifetime horse, believe me," trainer John Shirreffs said.

A smiling Smith pointed down at Zenyatta as he guided her into the winner's circle, greeted by loud cheers from the crowd of 20,329, many of them lining the rail.

"She only seemed to run about four jumps and then she shut it down," Smith said.

"The big dance is coming up next and that's all she needed to do today."

Zenyatta won a day after the owner of Rachel Alexandra said the star filly who beat the boys in the Preakness was finished racing for the year, ensuring they won't meet in a Breeders' Cup showdown.

"Queen Zenyatta" was one of the signs that greeted the mare in the winner's circle after her fourth win this year, all coming on the synthetic surfaces at each of Southern California's three major tracks.

"It's so much fun to see all her fans," co-owner Ann Moss said. "She enjoys herself. It's just really grand."

Zenyatta won the Lady's Secret a year ago before going on to win the Breeders' Cup Ladies' Classic.

This year's win guarantees Zenyatta a berth in the Ladies' Classic on November 6 at Santa Anita, but it's possible owners Jerry and Ann Moss will decide to run her against the boys in the $5 million Breeders Cup Classic a day later.

Jerry Moss said Zenyatta would be entered in both races.

"The horse is going to make the decision," he said.

"We want her to do well and be safe and be happy, but we also want to see how much she's got in her tank."

Smith made it clear where he stands on the choice of her next race.

"She can run with anyone, anytime, anywhere," he said.

"She has an amazing turn of foot, one that I've never seen before. I just have so much confidence in her. Today she had 10 gears and she only had to use four of them. She really loves this track."

Personal Ensign beat the boys in the 1988 Whitney Handicap at Saratoga, then ended her career by defeating Kentucky Derby winner Winning Colors by a nose in the BC Distaff that year.

"To be in the same ledger as she is, it's just awesome," Jerry Moss said.