user: Question: Name the men's singles for Christian Wagener Christian Esch
Columns: ['Year', "Men's singles", "Women's singles", "Men's doubles", "Women's doubles", 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1984.0, 'Romain Fritz', 'Martine Ludwig', 'No competition', 'No competition', 'No competition']
SQL:

assistant: SELECT "Men's singles" FROM "Table" WHERE "Men's doubles" = 'Christian Wagener Christian Esch';