Mayer's swing, zone control concern

Tony Massarotti is here with the debut of Breaking Balls. Mazz takes a look at two top Red Sox Prospects, Marcelo Mayer and Kristian Campbell, and explains why they are headed in opposite directions within the organization.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.