ABN AMRO World Tennis Tournament, Rotterdam
In 1972-1989 the tournament was a part of the Grand Prix Circuit. From 1990 to 1998 the tournament was a part of World Series (now - ATP World 250 series). In 1999 tennis tournament in Rotterdam was a part of Championship Series (now - ATP World 500 series). From 2000 to 2008 the tournament was a part of International Series Gold (now - ATP World 500 series). Since 2009, the tournament has been a part of the ATP World 500 series.