Two Red Sox in MLB.com rankings for third base: Machado, Ramirez, Riley, Devers, Arenado, Bregman, Turner, Muncy, Diaz, DJ.
I'll take Arenado and Bregman ahead of Machado, but Raffy would be the one I'd build a team around right now...
Two Red Sox are also in the rankings for first base prospects, including Casas at #1 and Kavadas at #10. The Rays, A's and Rockies also have two in the top 10 (1B/DH prospects?).