On this episode, Mark Simon (@markasimonsays) is joined by Orioles first baseman Ryan Mountcastle, Mariners bench coach Manny Acta (@mannyacta14), and SIS operations analyst Nick Rabasco (@nrabasco1).Ryan talks to us about playing first baseman, where he's been a league leader in our "Good Fielding Plays" stat, what it's been like to switch positions at various points in his baseball life, and how he puts technology to use (3:48).Manny talks to us about the details behind a recent article we wrote about the Mariners excellence in defensive positioning. He gives an intense breakdown of how the Mariners position their infielders, an approach that differs from many other teams. And he talks about how he collaborates with the team's analytics department (14:44).Nick explains what he does at SIS, then gets into a discussion with Mark about SIS' version of scorekeeping, what's so impressive about Mookie Betts, and how the Red Sox have changed their pitching approach under new coach Andrew Bailey (27:53). Thank you for listening. Please check out Archive.FieldingBible.com for your defensive stats needs, follow us on Twitter at @sis_baseball, and read our work at SportsInfoSolutions.com. You can e-mail us at Mark@sportsinfosolutions.com.