CREATE TABLE table_7852 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

For which tournament was the margin of victory 7 strokes?
SELECT "Tournament" FROM table_7852 WHERE "Margin of victory" = '7 strokes'
SELECT "Tournament" FROM "table_7852" WHERE "Margin of victory" = '7 strokes'