Peter Moody, trainer of the world’s best racehorse Black Caviar, has threatened to scratch the superstar from Saturday’s $1 million Group 1 TJ Smith Stakes (1200m) at Randwick if the continued rain in Sydney sees track conditions worsen.

Australia’s undisputed turf queen Black Caviar has overshadowed AJC Derby favourite Jimmy Choux as the headline attraction at Saturday’s meeting, but Sydney may miss the Black Caviar express if the weather doesn’t clear.

After extending her record-breaking succession of wins to 11 straight in the Group 1 William Reid Stakes (1200m) at Moonee Valley on March 25, Bel Esprit four-year-old Black Caviar is set to make her interstate debut in the 2011 TJ Smith Stakes.

There has been a remarkable build up to the Black Caviar show at Randwick on Derby Day.

“Saturday 9 April will be a historical moment in racing for a number of reasons,” Darren Pearce, the CEO of the ATC, said.

“Not only are we celebrating the running of the 150^th David Jones AJC Australian Derby, but we are also extremely privileged to witness Black Caviar’s first ever race outside of Victoria, on what is sure to be one of the biggest Sydney Carnival days in many years.”

“The public hype surrounding the arrival of Black Caviar has been overwhelming,” Pearce continued.

“I strongly encourage Sydneysiders to come to Royal Randwick and be part of Australian sporting history when the phenomenon that is Black Caviar hits the turf on this illustrious raceday.”

Moody, however, could possibly withdraw Black Caviar from the TJ Smith Stakes field not wanting to run his four time Group 1 winning star on a Slow – Heavy track.

Randwick was rated a Slow (6) on Tuesday morning.

Black Caviar has not raced on anything worse than dead (4) surfaces, on which she has recorded four of her 11 wins to date.

He hinted that he also was keen, however, to see how the queen would travel on softer ground.

“We’ve got to find out one day if she handles it,” Moody said.

At the present, Black Caviar is one of 11 sprinters accepted for the Darley TJ Smith Stakes, which will run as Randwick Race 5 at 2:20pm (AEST) on Saturday.

In the TJ Smith Stakes barrier draw Black Caviar came up with gate five, and if she runs, will continue her association with regular rider Luke Nolen.

Among the brave rivals set to take on Black Caviar on Saturday is the John Wallace-trained Shoot Out.

The Queensland galloper resumes racing in the TJ Smith Stakes, Shoot Out having his first start since finishing a well-beaten 13^th in the Melbourne Cup during the spring.

On a wet track Shoot Out comes into contention for a strong performance on Saturday, the High Chaparral four-year-old known to excel on rain-affected ground.

Shoot Out has enjoyed three wins and three placings from seven starts on slow ground.

“I doubt my bloke can beat Black Caviar and we’re probably running for second,” Wallace said.

“But anything can happen in racing and Shoot Out never runs a bad race and he loves the wet.”

Stay tuned to Races.com.au to view the full Derby Day race fields and form guides to be published shortly.