Johnson, 26, has allowed just two earned runs over two starts with Pawtucket this season, posting no record with a 1.69 ERA (10.2 IP) and striking out 15. The left-hander, whose only major league appearance came as a starter on July 21, 2015 at Houston, spent the 2016 season with the PawSox, going 5-6 with a 4.06 ERA (35 ER/77.0 IP) and 54 strikeouts in 15 Triple-A starts. Originally drafted by the Red Sox as a supplemental-round selection (31st overall) in the 2012 June Draft, Johnson is 29-22 with a 2.58 ERA (125 ER/436.0 IP) and 399 strikeouts in 87 career minor league starts, earning Red Sox Minor League Pitcher of the Year honors in 2014.
Taylor, 24, threw one-third of an inning in yesterday's win over the Rays, allowing one hit. After making his first career Opening Day roster in 2017 despite having never pitched above the Double-A level prior to the season, he has allowed only one run in 5.2 innings (1.59 ERA) in four relief appearances over two stints with Boston. According to the Elias Sports Bureau, Taylor became the only Red Sox pitcher in the expansion era to strike out each of his first three batters faced in the major leagues. Originally selected by the Red Sox in the seventh round of the 2015 June Draft, Taylor has posted a 2.49 ERA (21 ER/76.0 IP), a .198 opponent batting average, and 10.2 strikeouts per nine innings pitched in 37 career relief appearances in the minor leagues.