The Dutch Open originally known as the International Championships of the Netherlands was a tennis tournament played on outdoor clay court and held in three different locations in The Netherlands between 1957 and 2008. No tournament was organized in 1967. From 1957 to 1973 the tournament consisted of both men's and women's events but from 1975 onward only men's singles and doubles events were held.

Amersfoort is a city and municipality in the province of Utrecht, Netherlands. As of 31 January 2023, the municipality had a population of 160,902, making it the second-largest of the province and fifteenth-largest of the country. Amersfoort is also one of the largest Dutch railway junctions with its three stations—Amersfoort Centraal, Schothorst and Vathorst—due to its location on two of the Netherlands' main east to west and north to south railway lines. The city was used during the 1928 Summer Olympics as a venue for the modern pentathlon events. Amersfoort marked its 750th anniversary as a city in 2009.