Carp, 28, was placed on the 15-day disabled list with a fourth metatarsal fracture of his right foot on June 2 (retroactive to June 1). In a seven-game rehabilitation assignment, all with Pawtucket, Carp went 5-for-21 (.238) with a double, home run, three RBI, and two runs scored. He played three games at first base, two in left field, and two as designated hitter. In 33 games with Boston before landing on the DL, the left-handed batter hit .214 (15-for-70) with five doubles, six RBI, seven walks, and eight runs scored. Defensively, he did not committed an error between action at first base (14 games, 9 starts), left field (11 games, 8 starts), and third base (1 game). He also made his first professional pitching appearance in the ninth inning on April 24 against the Yankees. In parts of six big league seasons with the Mariners (2009-12) and Red Sox (2013-14), Carp has hit .262 (218-for-831) with 51 doubles, four triples, 27 home runs, 120 RBI, 81 walks, and 94 runs scored over 292 games.
Herrera, 29, has played in 42 games this season, his first with the Red Sox after being acquired from the Colorado Rockies in December 2013. The switch-hitter has batted .233 (21-for-90) with one double, two triples, nine RBI, seven walks, 10 runs scored, one stolen base, and three sacrifice hits, while appearing defensively at shortstop (16 games, 13 starts), third base (14 games, 8 starts), second base (9 games, 3 starts), and first base (1 game). In 417 major league games over parts of six seasons with the Rockies (2008, 2010-13) and Red Sox (2014), Herrera has hit .263 (282-for-1,074) with 29 doubles, nine triples, eight home runs, 75 RBI, 94 walks, and 122 runs scored.