Leon, who is due almost $2.5 million in 2019, went unclaimed on waivers and was sent to Pawtucket shortly before the season.
Consider it surprising, then, that this is how things end between Swihart and the Red Sox.
Swihart, 27, was hitting.231/.310/.385 with one double, one homer, and four RBI in 29 plate appearances this season for the defending champs. But he went hitless in his next 14 at-bats while striking out five times.
Designating Swihart cleared the way for Leon to return to the Red Sox, after the veteran backstop started the season with Pawtucket.
Boston will now move forward with Vazquez and Leon as its two catchers while Swihart will undoubtedly be picked up by another club. The 30-year-old is regarded as one of the best defensive catchers and game-callers in all of baseball. Both Sale and Rick Porcello, who have struggled horribly so far this year, view Leon as their preferred catcher and have raved about him publicly.
In case you're wondering, Leon was 3-for-25 this season with the PawSox.
Swihart was drafted by the Red Sox in the first round (26th overall) of the 2011 MLB Amateur Draft.
Swihart has played in 203 games during his Major League career, batting just.255.