CREATE TABLE table_9731 ("Tournament" CLOB, "Surface" CLOB, "Week" CLOB, "Winner" CLOB, "Finalist" CLOB, "Semi finalists" CLOB)

Which Tournament has a Semi finalists of martina hingis joannette kruger?
SELECT "Tournament" FROM table_9731 WHERE "Semi finalists" = 'martina hingis joannette kruger'
SELECT "Tournament" FROM "table_9731" WHERE "Semi finalists" = 'martina hingis joannette kruger'