|ABN AMRO World Tennis Tournament|
|Category||ATP Tour 500|
|Surface||Hard / indoor (1999–)|
|Draw||32S / 16Q / 16D|
|Prize money||€2,155,295 (2020)|
|Current champions (2021)|
|Doubles|| Nikola Mektić|
The Rotterdam Open (also known by its sponsored name ABN AMRO World Tennis Tournament) is a professional men's tennis tournament played on indoor hard courts. It is part of the ATP Tour 500 series on the ATP Tour and has been held annually at the Rotterdam Ahoy 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.
Since 2004, former Dutch tennis player Richard Krajicek has been the tournament director.
A record 115,894 people attended the 2012 edition tournament when Roger Federer returned for the first time in seven years. This record was broken in 2018 when 120,000 fans attended after Federer accepted a wildcard into the event after a five-year absence.
In the singles, Arthur Ashe (1972, 1975–76) and Roger Federer (2005, 2012 and 2018) hold the record for most titles with three, while Ashe, Stefan Edberg (1986–87), Nicolas Escudé (2001–02), Robin Söderling (2010–11) and Gaël Monfils (2019–20) co-hold the record for most consecutive titles with two. Federer (2001, 2005, 2012, and 2018) and Jimmy Connors (1978, 1981–82, and 1984) co-hold the record for most finals contested at four.
In the doubles, Anders Järryd (1987, 1991, 1993, 1995), Nenad Zimonjić (2009–10, 2012–13) and Nicolas Mahut (2014, 2016, 2018, 2020) co-hold the record for most titles with four, while Frew McMillan holds the record for most back-to-back titles with three straight wins (1974–76).
- 1972–1977 : WCT circuit
- 1978–1989 : Grand Prix circuit
- 1990–1998 : ATP World Series
- 1999–2008 : ATP Championship Series / International Series Gold
- 2009–current : ATP Tour 500
- "Live Tennis Guide Rotterdam Open". Retrieved February 17, 2012.
- "Bomb Scare Ends Rotterdam Final". NY Times. March 19, 1984. Retrieved 27 March 2012.
- "ABN AMRO WTT History". Retrieved March 18, 2012.
- "Federer gewinnt ATP-500-Turnier in Rotterdam - NZZ". 18 February 2018. Retrieved 9 April 2018 – via NZZ.
- "Past winners from official site". Retrieved March 7, 2021.