The U.S. , Japan and Mexico are three countries where there is a huge market and high popularity for professional wrestling .
The United States , Canada , Mexico , and Japan are countries that have a lot of professional wrestling .
The United States , Canada , Mexico , and Japan are countries that have a lot of professional wrestling .
Change to simpler wording: The U.S. , Japan and Mexico are three countries where there is a huge market and high popularity for professional wrestling . Output: