Boyer has posted a 3.14 ERA with two saves and 12 strikeouts in 10 relief appearances for Pawtucket. The 35-year-old brought a 14-25 career record and a 4.17 ERA over 394 Major League appearances into Sunday, when he recorded the final two outs in the top of the ninth in Boston's 5-0 loss to Seattle.
Johnson tossed a five-hit shutout in Saturday's 6-0 win over the Mariners. He became the first Red Sox pitcher to throw a shutout in his Fenway Park debut since Pedro Martinez accomplished the feat on April 11, 1998, also against Seattle.
With Boston set to activate David Price for Monday's game against the White Sox, the Red Sox optioned righty Brandon Workman to Pawtucket after Sunday's tilt.
Quinn Roberts is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.