2014 recap: Berrios flew through the minor leagues in just his second full season as a pro. He began with High-A Fort Myers and moved to Double-A New Britain after 16 starts. Berrios also advanced to Triple-A Rochester for one start. In his 25 combined games, Berrios posted a 2.77 ERA and struck out more than a batter an inning (140 in 139 2/3 innings). As a result of his quick rise through the minors, the former first-round pick is viewed as one of the best prospects in the system. Possible arrival: Berrios could start the year at Triple-A Rochester. Though there's a chance that fellow pitching prospect Alex Meyer might be the first of this list to make his MLB debut, Berrios might not be too far behind if he continues to pitch well.
Jerry Lai-USA TODAY SportsJerry Lai
RHP Nick Burdi
2014 recap: Burdi was the Twins' second-round pick in the 2014 draft. The 6-foot-5 Burdi can hit triple digits with his fastball and struck out 38 batters in just 20 1/3 innings after he was drafted in June. He began at Low-A Cedar Rapids before moving up to High-A Fort Myers at the end of the year. Possible arrival: As a college reliever, Burdi should be fast-tracked through the minors. He's already 22 years old as he enters his first full professional season. The Twins are set at the closer role with Glen Perkins, and right-hander Casey Fien appears ready to take over as the setup man. But it wouldn't be surprising to see Burdi earn a chance at some point in 2015, possibly in the later part of the season.
Jamie Rhodes-USA TODAY SportsJamie Rhodes
RHP Alex Meyer
2014 recap: In his second full season in the Twins organization after Minnesota traded for him, Meyer went 7-7 with a 3.52 ERA in 27 starts with Triple-A Rochester. He notched 153 strikeouts in 130 1/3 innings, but also walked 64. Still, he was viewed as one of the top-50 prospects in the game by almost all baseball publications. Possible arrival: Meyer recently turned 25, so his time to finally make his big-league debut should be nearing soon. He'll be one of about five pitchers competing for the fifth spot in the Twins' rotation this spring. If he doesn't earn that job, a spot in the bullpen is a possibility. Otherwise, expect Meyer to be one of, if not the first, pitcher the Twins call up from Triple-A in 2015.
Jerry Lai-USA TODAY SportsJerry Lai
3B Miguel Sano
2014 recap: After being heralded as one of the top prospects in baseball before the 2014 season, Sano suffered a season-ending elbow injury during spring training that required Tommy John surgery. Sano had previously spent more than half of the 2013 season at Double-A New Britain, so a big-league debut might have been possible in 2014 if he stayed healthy. Possible arrival: It remains to be seen how cautious the Twins will be with Sano as he works his way back from the major elbow surgery. Chances are he'll start the year at Double-A Chattanooga. If all goes well there and Sano continues to produce both offensively and defensively, a midseason promotion to Triple-A might be in order. If that's the case, it's possible we could see Sano in the majors by the end of 2015.
Steve Mitchell-USA TODAY SportsSteve Mitchell
2B/OF Eddie Rosario
2014 recap: Rosario doesn't get as much hype as Sano or top prospect Byron Buxton -- whose arrival in 2015 is a long shot -- but he's had a solid minor-league career since the Twins drafted him out of Puerto Rico in 2010. Rosario spent a good portion of the last two seasons in Double-A and is a career .260 hitter at that level. However, his progress was hampered by a 50-game suspension for a failed drug test, and he played in just 87 games in 2014. Possible arrival: One of Rosario's biggest assets is his versatility, as he can play second base or outfield. The Twins are pretty set at second base with Brian Dozier, but Rosario could provide some value as a backup there as well as in the outfield.