Emmanuel Lionel Mercer (15 November 1928 – 26 September 1959) was an English thoroughbred horse racing jockey.
A brother of jockey Joe Mercer, he was married to Susan, the daughter of trainer Harry Wragg.
[1] In 1954, Mercer won 88 races, including the 1954 2,000 Guineas Stakes on Darius, and finished second in the jockey standings to Doug Smith.
Mercer died on 26 September 1959 when a filly named Priddy Fair threw him before the start of the Red Deer Stakes at Ascot Racecourse.
[2] Reporting on his death, The Age newspaper in Melbourne called Mercer "one of Britain's most brilliant race riders".