Last season, the Boston Red Sox rolled with three catchers for the majority of the season. The three were Christian Vazquez, who was extended prior to 2018, Sandy Leon, who is known for his defensive ability, and Blake Swihart, the former top prospect who is out of options.
Defensively, the unit was outstanding, but offensively, one of the worst groups in baseball. Beyond these three, it is worth looking at the depth considering the 4th option, Dan Butler, retired and is now a bullpen catcher for the Diamondbacks. It is also likely that one of these three will not be with the team next year, likely either Leon or Swihart.