Colorado State Open

The Colorado State Open^[1] also known as the Colorado State Championships^[2] is a combined men's and women's hard court tennis tournament founded in 1891 as the Rocky Mountain Tennis Championships.^[3] The event was organised by the Western Lawn Tennis Association, the first championships was open to contestants from Colorade, New Mexico, Utah, and Wyoming.^[4] The first tournament held at the Denver Athletic Club and was played on outdoor clay courts.^[5] The current tournament is played on hard courts.

In 1891 the Rocky Mountain Tennis Championships were established.^[6] The tournament was played on outdoor clay courts at the Denver Athletic Club, Denver, Colorado, United States.^[7] In 1907 the tournament was moved to new venue the Denver Country Club and rebranded as the “Colorado State Championships”.^[8] Between 1921 and 1922 the championships were moved to Denver City Park.^[9][10] In 1924 a women's event was added to the schedule.^[11]

In 1942 the Colorado State Championships moved back to the Denver Country Club until 1945, when it moved back to Denver City Park.^[12] In 1946 the championships moved back to Denver Country Club until 1967.^[13] The championships were held in other locations, but moved to the new Gates Tennis Center facility consisting of twenty tennis courts in 1975.^[14] That year the tournaments name was changed to the Colorado State Open Tennis Championships.^[15] In 1988 the tournament was rebranded as the Colorado State Open.^[16]