user: Question: what tournament had Sam Querrey as the opponent?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['April 28, 2003', 'Montego Bay', 'Hard', 'Juan Mónaco', '2–6, 7–6 (7–3) , 6–0']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Opponent" = 'Sam Querrey';