user: Question: what's the singles w-l for Kim Doo-Hwan
Columns: ['Player', 'Years Played', 'Total W-L', 'Singles W-L', 'Doubles W-L']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Cho Soong-Jae (630)', '1 (2011)', '2–0', '1–0', '1–0']
SQL:

assistant: SELECT "Singles W-L" FROM "Table" WHERE "Player" = 'Kim Doo-Hwan';