CREATE TABLE table_43763 ("Date" TEXT, "Visitor" TEXT, "Score" TEXT, "Home" TEXT, "Leading scorer" TEXT, "Attendance" TEXT, "Record" TEXT)

On April 18, which team was the visitor?
SELECT "Visitor" FROM table_43763 WHERE "Date" = 'april 18'
SELECT "Visitor" FROM "table_43763" WHERE "Date" = 'april 18'