CREATE TABLE table_69550 ("Year" FLOAT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

What player played women's singles when marcus ellis heather olver played mixed doubles?
SELECT "Women's singles" FROM table_69550 WHERE "Mixed doubles" = 'marcus ellis heather olver'
SELECT "Women's singles" FROM "table_69550" WHERE "Mixed doubles" = 'marcus ellis heather olver'