user: Question: Which tournament had an opponent of Petra Krejsová Tereza Smitková?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '16 February 2008', 'Majorca , Spain', 'Clay', 'Polona Hercog', 'Leticia Costas Maite Gabarrus-Alonso', '7–6 (7–2) , 6–3']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Opponents" = 'Petra Krejsová Tereza Smitková';