Table: tennis_players
Columns: rk
name
country
matches_played
matches_won
points
prize_money_usd

Question: What country offered a prize of 66400 US dollars?
SQL: SELECT "country" FROM tennis_players WHERE "prize_money_usd" = 66400

Question: What country does the player named Mark Cox play for?
SQL: SELECT "country" FROM tennis_players WHERE "name" = 'Mark Cox'