CREATE TABLE table_name_73 (tournament VARCHAR, opponent_in_the_final VARCHAR, surface VARCHAR)

Which tournament had Toshiaki Sakai as an opponent in the final on a grass surface?
SELECT tournament FROM table_name_73 WHERE opponent_in_the_final = "toshiaki sakai" AND surface = "grass"
SELECT "tournament" FROM "table_name_73" WHERE "grass" = "surface" AND "opponent_in_the_final" = "toshiaki sakai"