user: Question: What was the 1999 Tournament at the US Open?
Columns: ['Tournament', '1988', '1990', '1991', '1992', '1993', '1995', '1996', '1997', '1998', '1999', '2000', '2001', 'Career SR', 'Career Win-Loss']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Australian Open', 'A', '2R', 'A', 'A', 'A', '1R', 'A', '1R', '2R', '2R', 'A', 'A', '0 / 5', '3–5']
SQL:

assistant: SELECT "1999" FROM "Table" WHERE "Tournament" = 'US Open';