The Rotterdam Open (sponsored by ABN AMRO and NOW called the ABN AMRO World Tennis Tournament) is a professional tennis tournament played on indoor hard courts. It is part of the 500 series of the ATP Tour. It has been held annually at the Ahoy Rotterdam in Rotterdam, Netherlands.
The first Rotterdam Open tennis tournament was held in November 1972 and was won by Arthur Ashe. The following year the tournament was not organized because it switched to a March date. Originally the Rotterdam Open was an event of the World Championship Tennis circuit and in 1978 became part of the Grand Prix tennis circuit. Since 1990 it has been part of the ATP Tour.
In 1984 the singles final between Ivan Lendl and Jimmy Connors was interrupted in the 2nd set (6–0, 1–0) due to a bomb alarm and the match was not finished as Lendl was not prepared to play on.
Since 2004, former Dutch tennis player Richard Krajicek has been the tournament director.
A record 115,894 people attended the 2012 edition tournament.