Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Men's singles | Women's singles | Men's doubles | Women's doubles | Mixed doubles |
| --- | --- | --- | --- | --- | --- |
| 1988.0 | Kim Brodersen | Katrin Schmidt | Markus Keck Robert Neumann | Katrin Schmidt Nicole Baldewein | Markus Keck Katrin Schmidt |
| 1989.0 | Sörgard | Katrin Schmidt | Stefan Frey Robert Neumann | Birgitta Lehnert Monica Halim | Chen Jin Katrin Schmidt |
| 1998.0 | Yong Yudianto | Karolina Ericsson | Michael Keck Christian Mohr | Erica van den Heuvel Judith Meulendijks | Michael Keck Nicol Pitro |
| 1999.0 | Oliver Pongratz | Zheng Yaqiong | Quinten van Dalm Dennis Lens | Britta Andersen Lene Mork | Chris Bruil Erica van den Heuvel |
| 2000.0 | Xie Yangchun | Xu Huaiwen | Michael Søgaard Joachim Fischer Nielsen | Claudia Vogelgsang Xu Huaiwen | Michael Keck Erica van den Heuvel |
| 2001.0 | Niels Christian Kaldau | Pi Hongyan | Michael Søgaard Michael Lamp | Neli Boteva Elena Nozdran | Chris Bruil Lotte Bruil-Jonathans |
| 2002.0 | Chen Gang | Pi Hongyan | Simon Archer Flandy Limpele | Mia Audina Lotte Bruil-Jonathans | Nathan Robertson Gail Emms |
| 2003.0 | Dicky Palyama | Xu Huaiwen | Michał Łogosz Robert Mateusiak | Nicole Grether Juliane Schenk | Frederik Bergström Johanna Persson |
| 2004.0 | Niels Christian Kaldau | Xu Huaiwen | Simon Archer Anthony Clark | Kamila Augustyn Nadieżda Kostiuczyk | Rasmus Mangor Andersen Britta Andersen |
| 2005.0 | Kasper Ødum | Xu Huaiwen | Tony Gunawan Halim Haryanto | Nicole Grether Juliane Schenk | Vladislav Druzhchenko Johanna Persson |
| 2006.0 | Ronald Susilo | Xu Huaiwen | Michał Łogosz Robert Mateusiak | Jiang Yanmei Li Yujia | Robert Mateusiak Nadieżda Kostiuczyk |
| 2007.0 | Lu Yi | Wang Yihan | Mathias Boe Carsten Mogensen | Yang Wei Zhang Jiewen | Kristof Hopp Birgit Overzier |
| 2008.0 | Chetan Anand | Maria Febe Kusumastuti | Mathias Boe Carsten Mogensen | Helle Nielsen Marie Roepke | Diju Valiyaveetil Jwala Gutta |
| 2009.0 | Jan Ø. Jørgensen | Juliane Schenk | Rupesh Kumar Sanave Thomas | Helle Nielsen Marie Roepke | Mikkel Delbo Larsen Mie Schjoett-Kristensen |
| 2010.0 | Chen Long | Liu Xin | Mathias Boe Carsten Mogensen | Pan Pan Tian Qing | Zhang Nan Zhao Yunlei |
| 2011.0 | Hans-Kristian Vittinghus | Li Xuerui | Bodin Isara Maneepong Jongjit | Mizuki Fujii Reika Kakiiwa | Chan Peng Soon Goh Liu Ying |
| 2012.0 | Chou Tien-chen | Juliane Schenk | Ingo Kindervater Johannes Schoettler | Wang Rong Zhang Zhibo | Anders Kristiansen Julie Houmann |
| 2013.0 | Chou Tien-chen | Nichaon Jindapon | Mads Conrad-Petersen Mads Pieler Kolding | Eefje Muskens Selena Piek | Michael Fuchs Birgit Michels |
Question:
Who won the men's singles in 1999?
Answer:
Oliver Pongratz