user: Question: What Tournament has a Date of 20 December 2010?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '7 July 2008', 'Prokuplje , Serbia', 'Clay', 'Karin Morgošová', '6–0, 6–1']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Date" = '20 December 2010';