user: Question: What is Player, when Country is "United States", and when To Par is "WD"?
Columns: ['Player', 'Country', 'Year(s) won', 'Total', 'To par']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Ernie Els', 'South Africa', '1994 , 1997', '148', '+8']
SQL:

assistant: SELECT "Player" FROM "Table" WHERE "Country" = 'United States' AND "To par" = 'WD';