It returned to the schedule as a one-off event in 2001 to replace the Estoril Open, which was cancelled by organisers due to security concerns following the 9/11 attacks in the United States.
Cannes | Australian Open | Cannes Film Festival | French Open | Open University | open source | U.S. Open | Wacken Open Air | The Open Championship | U.S. Open (tennis) | All England Open Badminton Championships | U.S. Open (golf) | Open Source | Open-pit mining | 2006 Australian Open | Open Software Foundation | Indira Gandhi National Open University | Lamar Hunt U.S. Open Cup | 2005 Australian Open – Men's Singles | U.S. Women's Open | open access | Gerry Weber Open | Swedish Open | International GT Open | Federal Open Market Committee | 2014 Australian Open – Men's Singles | 2008 Australian Open – Men's Singles#Finals | WTA German Open | U.S. Open Polo Championship | U.S. Open Badminton Championships |