"Yesterday's race while a disappointment, helped us define Rachel Alexandra's racing condition," Jackson said in a statement on Sunday. "While she is healthy, just as I had anticipated, she is not in top form. Therefore, I decided today she will not be going to the Oaklawn Invitational on April 9."

Zenyatta, on the other hand, won her 2010 racing debut at the $250,000 Santa Margarita Invitational on Saturday and maintains her perfect record. She's still off to Oaklawn Park in Arkansas for the Grade I Apple Blossom, but with the highly anticipated matchup between Zenyatta and Rachel Alexandra called off, the $5 million purse will be replaced by the race's original purse of $500,000.

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With Mike Smith on board, Zenyatta will start from post position eight in the 1 1/8- mile race.

Here is the list of the nine horses running in this Saturday's Santa Margarita in order of post positions, as well as jockeys: Dance to My Tune, Martin Garcia; Pretty Katherine, Joel Rosario; Made for Magic,Omar Berrio; Pretty Unusual, Chantal Sutherland; Striking Dancer, Alex Solis; Powerofvoodoo, Tyler Kaplan; Gripsholm Castle, Victor Espinoza; Zenyatta, Mike Smith and Floating Heart, Joe Talamo.

Owned by Jerry and Ann Moss, Zenyatta is trained by John Shirreffs. Her resume boasts 14 wins, two championships, and zero career losses. She became the first female to win the Breeders' Cup.

Will Zenyatta win the Santa Margarita on Saturday? Can she beat Rachel at the Apple Blossom in April? Get all your horse betting in the Bodog Racebook now.

Rachel Alexandra drew the No. 2 post position and will face Zardana, who is trained by Zenyatta's trainer, John Shirreffs. With regular jockey Calvin Borel aboard, Rachel will also face Fighter Wing, Unforgotten and Clear Sailing.

On Monday, Rachel Alexandra breezed 4 furlongs in 49 seconds in her seventh workout this year.

Her trainer Steve Asmussen said Rachel "went beautiful … did very well, looked good."

Owned by Jess Jackson, Rachel Alexandra was the first filly to win the Preakness Stakes in 85 years. Zenyatta won the Eclipse Award as the top older female for the second straight year, while Rachel Alexandra was voted top three-year-old filly, taking the title of 2009 Horse of the Year. Do you think Rachel will blow away the competition on Saturday? Will Zenyatta or Rachel prevail at the Apple Blossom in April? Get all your horse betting in the Bodog Racebook now.

In a Boston Herald report trainer Steve Asmussen said the reason behind the date change was because "the earliest we could have a prep race would be the middle of March" and that it was "not fair to Rachel to ask her to race again three weeks later."

Online horse racing bettors will be interested to note that both Zenyatta and Rachel Alexandra have won at Oaklawn in the past; Zenyatta won the 2008 Apple Blossom at Oaklawn and Rachel Alexandra won the Martha Washington Stakes and the Grade II Fantasy Stakes at Oaklawn.

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Accepting the trophy of the evening for Rachel Alexandra, owner Jess Jackson had this to say: "As long as Rachel is able to run and compete at the top level, we look forward to running at least another year."

What's interesting is that Rachel Alexandra and Zenyatta have never raced each other and if you were to ask Zenyatta's owner Jerry Moss which of the two is more deserving of the Horse of the Year award — well, see for  yourself: "Zenyatta's never lost, she's perfect. Nobody's beaten her on the racetrack, so they beat her by proxy as far as I'm concerned."

Zenyatta won the Eclipse Award as the top older female for the second straight year, while Rachel Alexandra was voted top three-year-old filly. Steve Asmussen, Rachel Alexandra's trainer, took home the award for (you guessed it) top trainer.

The Eclipse Awards are voted on by members of the National Turf Writers' Association, the Daily Racing Form and the National Thoroughbred Racing Association.

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Do the names Well Armed, Mine That Bird, Summer Bird, Rachel Alexandra and Zenyatta ring a bell?

Bodog Racebook went the distance with all the best online horse racing odds for all the big stakes races, with extras like horse racing analysis from the experts (Steve Davidowitz and Dave Tuley) PLUS weekly articles covering racetracks from the U.S. East & West Coast, and abroad.

Read this week's 2009 Year In Review for all the highlights.
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No matter how you look at it, the great debate between which horse will or should win the Eclipse Award – American Horse of the Year is particularly interesting because it involves two females. The last female horse to win the American Horse of the Year Award was Azeri in 2002.

So, Rachel Alexandra or Zenyatta? Which one's got your vote?
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Rachel Alexandra went 8 for 8 this year, posted three wins over the boys — including her impressive win in the Preakness Stakes. For that victory she became the first filly in 85 years to one-up the dudes.

"The one thing everybody keeps forgetting, she beat the fillies with authority," Mine That Bird trainer Chip Woolley Jr. said of Rachel Alexandra. "She didn't win by a neck or a length or two lengths. She beat 'em by 20 and in a big gallop. When you look at that and you put everything together, I think she's a very deserving champion."

Zenyatta, on the other hand, went 5 for 5 this year and last weekend's Breeders' Cup Classic win was her first against the boys. And it will likely be her last as trainer John Shirreffs says she will be sent to Kentucky for breeding. (Rachel Alexandra will be back next season, however.)

Still, some are quick to judge Rachel Alexandra for skipping out on the Breeders' Cup, which is considered a championship event.

"Each sport has their championship game," said Summer Bird's trainer Tim Ice. "If you don't compete in the championship game, then you shouldn't be a champion. This is the highlight of the year as far as all the great horses coming together. This should name Horse of the Year."

Looking back at Curlin — he took the American Horse of the Year awards two years in a row, winning it in 2007 and 2008. He did not, however, win the Breeders's Cup Classic both years. Curlin won the Breeders' Cup Classic in 2007 and it was Raven's Pass who claimed that victory in 2008.

The American Horse of the Year — along with all other Eclipse Awards — will be announced in January at the Beverly Hills ceremony.

Interesting indeed. Bet on horse racing at Bodog.

Never let it be said that a girl can't compete and win against the boys.

In front of close to 59,000 fans on hand at Santa Anita to watch the $5 million Breeders' Cup Classic, Zenyatta (ridden by jockey Mike Smith) ran 1 1/4 miles in 2:00.62 and paid $7.60, $5.60 and $3.80 as the 5-2 odds on favorite to win. Gio Ponti returned $9.20 and $6.60, while Twice Over paid $7 to show.

Summer Bird came in fourth while Mine That Bird finished a disappointing 9th. Quality Road was scratched from the race following an incident at the starting gate.

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"I think the horse will make the decision," Moss said from the winner's circle at Santa Anita.

Jockey Mike Smith led Zenyatta across the finish line in 1:42.89, 1 1/4 lengths ahead of second place finisher Lethal Heat. Cocoa Beach came in third.

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Post  Horse            Win   Place  Show
1  ZENYATTA                $3    $2.60  $2.10
3  COCOA BEACH (CHI)         $4.60  $3.80
4  MUSIC NOTE                      $3.80

• $2 Exacta pays out $13.40
• $2 Trifecta pays out $68.60
• $1 Superfecta pays out $116.80
• $2 Daily Double pays out $19.40
• $1 Pick 3 pays out $26.30
• High 5 pays out $254.50

Don't forget to place your bets for tomorrows big race. Will Curlin win the Breeders' Cup Classic for a second-year running? Bet on Curlin in the Bodog Racebook.