 On May 30, he was added to Boston's active MLB roster, as Héctor Velázquez was placed on the injured list.Shawaryn made his MLB debut on June 7 against the Tampa Bay Rays, pitching two innings in relief and striking out four while giving up one run on a home run by Kevin Kiermaier.Shawaryn was optioned back to Pawtucket on July 1, having appeared eight games (all in relief) with an 8.53 ERA while striking out 20 in innings.