Madrid | Australian Open | French Open | Open University | open source | Complutense University of Madrid | U.S. Open | Real Madrid C.F. | Autonomous University of Madrid | Atlético Madrid | Wacken Open Air | The Open Championship | U.S. Open (tennis) | University of Madrid | 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 | Technical University of Madrid | Lamar Hunt U.S. Open Cup | Royal Palace of Madrid | Real Madrid Baloncesto | 2005 Australian Open – Men's Singles | U.S. Women's Open | open access | Gerry Weber Open | Swedish Open |
The 2009 Madrid Masters (also known as the Mutua Madrileña Madrid Open for sponsorship reasons) is a tennis tournament played on outdoor clay courts.