Morrison, 28, hit .225 (103-for-457) with 17 home runs and 54 RBI in a career-high 146 games (117 starts) in 2015, his first time appearing in at least 100 games since 2011. His home run and RBI totals were his most since he had 23 homers and 72 RBI with the Marlins in 2011. In his career, Morrison has made 284 starts at first base and 249 starts in the outfield (241-LF, 8-RF).
Farquhar, 28, went 1-8 with a 5.12 ERA (51-IP, 29-ER) in 43 appearances spanning five stints with the Mariners in 2015. After pitching to a 6.23 ERA (30.1-IP, 21-ER) in 25 appearances before the All-Star break, he registered a 3.48 ERA (20.2-IP, 8-ER) in 18 games in the second half. He has a career 3.96 ERA over parts of four seasons (2011, 2013-15) in the majors, all with the Mariners, including 16 saves in 2013, which led AL rookies.
Karns, who will turn 28 on Nov. 25, was named the team's Outstanding Rookie by the Tampa Bay Chapter of the Baseball Writers' Association of America. He went 7-5 with a 3.67 ERA (147-IP, 60-ER) and led American League rookies with 26 starts, 147 innings and 145 strikeouts. He allowed two runs or fewer in 19 of his starts, a Rays rookie record and tied for fifth in the AL.
Riefenhauser, 25, made 17 appearances over four stints with the Rays in 2015, going 1-0 with a 5.52 ERA (14.2-IP, 9-ER). His best performance came after his September call-up, when he recorded a 2.16 ERA (8.1-IP, 2-ER) in 11 games. A 20th-round selection by the Rays in the 2010 June Draft, he made his major league debut in 2014, when he made seven appearances.
Powell, 22, split the season between Double-A Montgomery and Triple-A Durham and ranked third in the Rays minor league system with a combined .295 batting avg. (131-for-444). The left-handed hitter batted .328/.408/.416 (78-for-238) for Montgomery, was named a Southern League midseason All-Star and earned a late-June promotion to Durham. He combined for three home runs, 40 RBI, 66 runs scored, 18 stolen bases and a .385 on-base pct. He was acquired from the Oakland Athletics as part of a five-player trade on Jan. 10.