The 36-year-old Atchison appeared in 42 games for the Red Sox in 2012, all in relief, going 2-1 with five holds, a 1.58 ERA (9 ER/51.1 IP) and 36 strikeouts. He missed 55 games on the disabled list due to a right elbow strain from mid-July through mid-September. Atchison has pitched for Boston in each of the last three seasons and is 7-7 with one save, a 3.48 ERA (81 ER/209.2 IP) and 164 strikeouts in 155 career Major League outings (1 start) between the Mariners (2004-05), Giants (2007) and Red Sox (2010-12). He was originally selected by the Mariners in the 49th round of the 1998 First-Year Player Draft.
Hill, 32, appeared in relief in 25 games for the Red Sox last season after returning from Tommy John surgery in April. He went 1-0 with six holds, a 1.83 ERA (4 ER/19.2 IP) and 21 strikeouts. The left-hander has appeared in 40 games for the Red Sox, all out of the bullpen, since joining the organization as a minor league free agent during the 2010 season. Originally signed by the Cubs in the fourth round of the 2002 First-Year Player Draft, he owns a 23-20 record with a 4.59 ERA (218 ER/427.0 IP) and 391 strikeouts in 118 career Major League games (70 starts) with the Cubs (2005-08), Orioles (2009) and Red Sox (2010-12).
Sweeney, 27, was limited to 63 games due to three stints to the disabled list last season, his first year with the Red Sox. The left-handed batter hit .260 (53-for-204) with 19 doubles, two triples, 16 RBI, 22 runs scored and 12 walks. He made 50 starts, including 35 in right field and 15 in center field. A second-round selection by the White Sox in the 2003 First-Year Player Draft, Sweeney is a career .280 hitter (481-for-1,719) with 102 doubles, 12 triples, 14 home runs and 185 RBI over 535 Major League games with the White Sox (2006-07), Athletics (2008-11) and Red Sox (2012).
With these moves, Boston’s 40-man roster is now at 37.