May, 24, was heralded as one of the Twins' top pitching prospects, along with fellow right-hander Alex Meyer. While Meyer has yet to make his major-league debut, May made his last weekend in Oakland -- and it was not at all how he envisioned it. May walked seven batters in just two innings of work, something that only two other pitchers since 1914 had done in their debuts. But one bad start does not doom a career, and May will have several more chances in August and September to prove that he can pitch at the major-league level. The biggest thing he'll need to show is improved command. He put up impressive numbers at Triple-A Rochester this season, going 8-6 with a 2.84 ERA in 18 starts. Now it's a matter of translating that success in the minors to the big leagues.
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OF Aaron Hicks
Hicks is still technically in the minors, playing for Triple-A Rochester. But there's a good chance we'll see him back up with the Twins before the end of the season, whether in August or as a September call-up. Hicks made his major-league debut at the start of last season, skipping Triple-A in the process. He struggled with big-league pitching and was demoted. The same thing happened in 2014. After beginning the year as the Twins' starting center fielder, he was eventually optioned to Double-A to try and find his swing. He gave up switch hitting in the middle of the season, but has since picked it back up, which drew frustration from Twins brass. Minnesota still hopes Hicks can be a starting outfielder for years, but he hasn't figured out how to hit consistently in the majors. He should get another chance to end 2014 on a high note.
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1B/DH Kennys Vargas
Vargas debuted with the Twins on Aug. 1, his 24th birthday, and has since played in 12 games with Minnesota. Known for his power in the minor leagues, Vargas has already displayed some of the pop in his bat with a pair of home runs. And while he's also been able to hit for average -- he's hitting .300 entering Friday's game against Kansas City -- he's already struck out 16 times in 50 at-bats. Vargas has a chance to spend 2015 in the majors, although the fact that Joe Mauer now plays the same position as him doesn't exactly help Vargas' chances. Now that Mauer is back from the disabled list, Vargas needs to prove he can thrive as a designated hitter and occasional first baseman, which is what his role would be if he were to make the team next year. He also needs to learn how to hit offspeed pitches.
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OF/SS Danny Santana
Few hitters have been as fun to watch this year as Santana, who won't turn 24 until November. In his first 61 games as a big leaguer, he's batting .331 with five homers, 27 RBI and 11 stolen bases. However, 236 at-bats isn't a big enough sample size to prove Santana can sustain that offense throughout his career. With a month and a half to go, he'll get 100 or so more plate appearances to make a statement at the plate. Additionally, Santana should be transitioning back to his natural position of shortstop between now and the end of September. The Twins claimed Jordan Schafer off waivers from Atlanta, which means Santana (who'd been the everyday center fielder) can spend more time at shortstop. That's where he'll likely play if he ends up being part of the Twins' future, so he'll need to show he can handle it on a daily basis.
Troy Taormina-USA TODAY SportsTroy Taormina
LHP Tommy Milone
At 27, Milone's the oldest player on this list. But he's a new face in the clubhouse after Minnesota traded for him by sending outfielder Sam Fuld to Oakland at the end of July. After one start at Triple-A, Milone was called up by the Twins. He's since made one start and allowed two runs in six innings while striking out five. The Twins have used 12 different starting pitchers this year and need to start figuring out what next year's rotation will look like. Milone can insert himself into the conversation with a strong finish to the 2014 season. He's had success at the major-league level, posting a 6-3 record with a 3.52 ERA in 16 starts for Oakland this season before he was traded. Though he won't be a front-of-the-rotation guy, Milone has an opportunity to establish himself as the Twins' No. 4 or No. 5 starter next year.