user: Question: What date has Yani Tseng as the runner (s)-up?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['23 Mar 2008', 'Yokohama Tire PRGR Ladies Cup', '−4 (70-69-73=212)', 'Playoff', 'Sakura Yokomine']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Runner(s)-up" = 'Yani Tseng';