"May 27, 1823: A $20,000 match race between American Eclipse (representing The North) and Henry (representing The South) was held at Union Course, Long Island. Eclipse won in two-of-three heats, after his original jockey, William Crafts, was replaced by Samuel Purdy before the second heat. The race, witnessed by 60,000 spectators, was the first to have been timed by split-second chronometers, which were imported for the event." (from the NTRA)
And trainers are worried about running their horses 3 times in 5 weeks.
