Two weeks after winning the Kentucky Derby, American Pharoah entered the second leg of the Triple Crown, the 2015 Preakness Stakes, run over nine and a half furlongs at Pimlico Race Course.
Despite an unfavorable inside draw of the number one post position, he was installed as the morning line favorite ahead of Firing Line and Dortmund.
No horse had won the Preakness starting from the rail since 1994.
Immediately before post time, the weather changed to a heavy downpour with thunder.
The last time the Preakness had been run on a sloppy track was in 1983, and American Pharoah was the only horse in the field to have previously faced similar conditions, having won the Rebel Stakes running in rain and mud.

American Pharoah had the lead within the first quarter-mile and was challenged by Mr. Z early on, but held the lead on the inside throughout the race.
He was challenged by Dortmund and then Divining Rod, but American Pharoah broke from the pack in the homestretch and won by seven lengths, as Tale of Verve made a strong rally to overtake Divining Rod to place.
Firing Line slipped badly at the start and was eased in the stretch.
The winning time was 1:58.45.
Espinoza did not use his whip at all in the Preakness, and stated, "I couldn't see how far I was in front because there was so much water in my eyes."
The margin of victory was tied for the sixth-largest in Preakness history.
The win by American Pharoah set up an attempt for the Triple Crown for the second straight year.
It was also the second straight year that Espinoza had won both the Kentucky Derby and Preakness Stakes and the jockey's third time winning both races.
 For Baffert, it was the fourth time in 19 years that he won the first two Triple Crown races.
Of the colt, Baffert said, "He brought his A-game today."
Two weeks after winning the Kentucky Derby, American Pharoah entered the second leg of the Triple Crown, the 2015 Preakness Stakes, run over nine and a half furlongs at Pimlico Race Course. Despite an unfavorable inside draw of the number one post position, he was installed as the morning line favorite ahead of Firing Line and Dortmund. No horse had won the Preakness starting from the rail since 1994. Immediately before post time, the weather changed to a heavy downpour with thunder. The last time the Preakness had been run on a sloppy track was in 1983, and American Pharoah was the only horse in the field to have previously faced similar conditions, having won the Rebel Stakes running in rain and mud.
American Pharoah had the lead within the first quarter-mile and was challenged by Mr. Z early on, but held the lead on the inside throughout the race. He was challenged by Dortmund and then Divining Rod, but American Pharoah broke from the pack in the homestretch and won by seven lengths, as Tale of Verve made a strong rally to overtake Divining Rod to place. Firing Line slipped badly at the start and was eased in the stretch. The winning time was 1:58.45. Espinoza did not use his whip at all in the Preakness, and stated, "I couldn't see how far I was in front because there was so much water in my eyes." The margin of victory was tied for the sixth-largest in Preakness history. The win by American Pharoah set up an attempt for the Triple Crown for the second straight year. It was also the second straight year that Espinoza had won both the Kentucky Derby and Preakness Stakes and the jockey's third time winning both races.  For Baffert, it was the fourth time in 19 years that he won the first two Triple Crown races. Of the colt, Baffert said, "He brought his A-game today."
American Pharoah