CREATE TABLE table_35954 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent" CLOB, "Score" CLOB)

What is the tournament with a hard surface and Ruben de Kleijn as the opponent?
SELECT "Tournament" FROM table_35954 WHERE "Surface" = 'hard' AND "Opponent" = 'ruben de kleijn'
SELECT "Tournament" FROM "table_35954" WHERE "Opponent" = 'ruben de kleijn' AND "Surface" = 'hard'