Croatia | Australian Open | 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 | Socialist Republic of Croatia | 2005 Australian Open – Men's Singles | U.S. Women's Open | Parliament of Croatia | open access | Gerry Weber Open | Swedish Open | International GT Open | Federal Open Market Committee | Bol, Croatia | 2014 Australian Open – Men's Singles | 2008 Australian Open – Men's Singles#Finals | WTA German Open |
It was the 21st edition of the Croatia Open Umag, and was part of the ATP World Tour 250 Series of the 2010 ATP World Tour.