The Twins claimed Roenicke, 31, off waivers from the Rockies last offseason, and he spent the entire season in the team's bullpen. Roenicke posted a 4.35 ERA with 6.5 K/9 and 5.2 BB/9 in 62 innings for Minnesota, appearing in 63 games and earning one save along the way. Roenicke is eligible for arbitration this offseason, but because he has more than three years of service time and was outrighted off the 40-man roster, he is eligible to elect free agency.
Thomas came to the plate 322 times for the 2013 Twins despite slashing just .214/.290/.307 and striking out in 28.6 percent of his plate appearances. Thomas' sound defensive play kept him in the lineup, as he appeared at all three outfield positions and totaled a UZR/150 mark of +9.6 in 727 1/3 innings.
De Vries was injured for most of the season and allowed 18 runs in 15 innings at the Major League level. The 27-year-old's minor league numbers didn't look much better, as he posted a 7.02 ERA in 50 innings at Triple-A.
Martis totaled a 4.26 ERA with 7.3 K/9 and 3.5 BB/9 in 80 1/3 innings in the minors and yielded six runs in 9 2/3 Major League innings. The Curacao native reached the Majors in 2013 for the first time since pitching more than 100 innings for the 2008-09 Nationals.