CREATE TABLE table_58268 ("Date" TEXT, "Visitor" TEXT, "Score" TEXT, "Home" TEXT, "Series" TEXT)

What is the series score of the game with Vancouver as the visiting team on April 16?
SELECT "Series" FROM table_58268 WHERE "Visitor" = 'vancouver' AND "Date" = 'april 16'
SELECT "Series" FROM "table_58268" WHERE "Date" = 'april 16' AND "Visitor" = 'vancouver'