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The race for this year's Triple Crown begins with the 2018 Kentucky Derby on Saturday, when 20 horses hailing from the United States, Europe and Japan will compete in the Run for the Roses.

Reasons to be wary: If Justify is to win, he'll have to break the "Curse of Apollo" to do it.

Flameaway: The Mark Casse trained colt has won two races on wet tracks.

I arrived at these five horses based on what I considered to be the best Derby prep races. Always Dreaming won last year's Kentucky Derby, but he failed to capture the Triple Crown title after losing at the Preakness.

While picking the favorite might not seem like any fun given the lack of risk involved, it's been the smart pick recently at Churchill Downs.

Why he can win: Audible has won four straight races coming into this one, and is racing out of post five, which has produced a remarkable five Derby winners in the past 21 years.

Audible jockey John R. Velazquez and trainer Todd Pletcher in the winner's circle after winning the Florida Derby at Gulfstream Park in Hallandale, Fla., on Saturday, March 31, 2018.

Europe's best performance dates back to 1986, when Bold Arrangement finished second to Ferdinand, despite a 36-hour quarantine period in NY followed by an 18-hour van journey to Kentucky. None of the others has won a Derby.

After his commanding win in the UAE Derby, Mendelssohn is now the joint 4-1 favorite alongside Justify with United Kingdom bookmaker William Hill to win the Kentucky Derby.

Sired by the late Florida Derby victor Scat Daddy and out of the 2016 Kentucky broodmare of the year, Leslie's Lady, Mendelssohn was born at Clarkland Farm in Kentucky in 2015.

We're down to the final race in the Derby Dollars Contest, sponsored by 123bet.com and The Paulick Report.

The race takes place on Saturday, 5 May at 11.50pm United Kingdom time (6.50pm in Louisville).

Justify: The Morning Line favorite for the Derby has raced just three times, but one of the three was on a muddy track. He's just a fun horse to watch. Most people think of YouTube for its popular video-hosting website, but the live, online television service offers a lot more than just cat videos. My Boy Jack is a good horse to play at higher odds, opening at 30/1, depending on where you are in the standings.