คู่ต่อสู้ใน Tarragona Tournament คืออะไร? ไม่จำเป็นต้องใช้ตารางทั้งหมด
What was the Opponent in the Tarragona Tournament?It is not neccessary to use all the tables.
 table_47431:  "Date" [ text]  "Tournament" [ text]  "Surface" [ text]  "Opponent" [ text]  "Score" [ text] 
SELECT "Opponent" FROM table_47431 WHERE "Tournament" = 'tarragona'