Day Star (1875–1893) was the winner of the 4th annual Kentucky Derby held at Churchill Downs on May 21, 1878. He was a chestnut colt that was foaled in Kentucky and was sired by Star Davis (by the successful Glencoe). His dam was Squeeze-'em who was sired by Lexington, a foundation sire of many modern Thoroughbred lineages. Day Star won the Derby by two lengths in an official time of 2:37.25, beating the race record set by Aristides in 1875, and winning a total of $4,050. In his career, he had 42 starts, 11 wins, 7 places and 5 shows. A 1910 Daily Racing Form article states that Day Star was sold after his racing career and stood at stud on a western farm, dying at the age of 18 years in 1893.

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