CREATE TABLE table_71273 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" TEXT, "Record" TEXT)

Who did the Blue Jays play against on April 11?
SELECT "Opponent" FROM table_71273 WHERE "Date" = 'april 11'
SELECT "Opponent" FROM "table_71273" WHERE "Date" = 'april 11'