CREATE TABLE table_73319 ("Outcome" TEXT, "Year" FLOAT, "Championship" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

Who were the opponents that led to an outcome of winner on a grass surface?
SELECT "Opponents" FROM table_73319 WHERE "Outcome" = 'Winner' AND "Surface" = 'Grass'
SELECT "Opponents" FROM "table_73319" WHERE "Outcome" = 'Winner' AND "Surface" = 'Grass'