The Red Sox have acquired 22-year-old catching prospect Luke Heyman from the Mariners for minor-league pitcher Alex Hoppe, according to a source.

It was one of four trades that Boston made Tuesday. The Sox dealt lefty Chris Murphy to the White Sox for minor-league catcher Ronny Hernandez and righty Luis Guerrero to the Rays for infielder Tristan Gray . They also sent left-handed reliever Brennan Bernardino to the Rockies for 26-year-old infielder/outfielder Braiden Ward.

The Red Sox’ busy Tuesday also included them designating both first baseman Nathaniel Lowe and pitcher Josh Winckowski for assignment as well as selecting pitching prospects David Sandlin, Shane Drohan and Tyler Uberstine to the 40-man roster . Neither Hoppe or Heyman was on a 40-man roster at the time of the

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