American Pharoah won the Grand Slam of Thoroughbred Racing in 2015 by winning the Triple Crown and the Breeders' Cup Classic.
He also set the track record in the Classic at Keeneland posting a 2:00.07 and won by a record .5 lengths.
However, there is one horse that might be considered faster in the Classic. Ghostzapper holds the record for the fastest Breeders' Cup Classic in history. He ran a 1:59:02 at Lone Star Park in 2004.