
American Pharoah will run his final race at Saturday's Breeders' Cup Classic.

The three-year-old is aiming become the first horse to win the Triple Crown and the Classic in the same season.

He has caught the attention of the wider American public, with up to 20,000 people watching one of his recent run-outs.

Some fans have taken their infatuation to extremes, such as this tattoo-loving racegoer.

Others choose to dress up like American Pharoah, who is seeking to round off an astonishing year.

His first major victory of 2015 came at May's Kentucky Derby.

The second leg of the Triple Crown was completed two weeks later in torrid conditions at the Preakness Stakes on May 16.

Next up was the Belmont Stakes on June 6.

American Pharoah became the first Triple Crown winner for 37 years.

He is bidding to go another step further in his final race, despite a shock defeat in his last outing.

American Pharoah's success has transcended the sport -- his jockey Victor Espinoza appeared on the TV series "Dancing with the Stars" and threw the first pitch at a New York Yankees game.

His owner Ahmed Zayat had toyed with retiring the horse before the Classic after placing second at the Travers Stakes on August 29.

But after consulting with trainer Bob Baffert, Zayat has entered the horse for the $5 million Classic, the richest race in the U.S.

The sun is setting on what has been a truly illustrious career.

But his earning power will continue after retirement, with American Pharoah's stud fees predicted to be in excess of $150,000.