Marcell Ozuna, MIA - Hit .265 with 3 HRs and 5 SBs over 291 plate appearances for the Miami Marlins. He seems to be one of their building blocks for the future in the Miami outfield. Unfortunately, his season ended in late July to repair a fracture in his left thumb.
Nolan Arenado, COL - Hit .269 with 10Hrs over 503 plate appearances for the Rockies at third base. He has showcased excellent fielding and is probably their third baseman of the future unless they decide to move Arenado to first following Todd Helton's retirement.
Anthony Rendon, WSH - Hit .261 with 7 HRs over 386 plate appearances. He was recalled in April to fill in for the injured Ryan Zimmerman but saw much more action when he replaced the struggling Danny Espinosa at second base. Rendon was considered one of the top prospects in baseball and will most likely keep his spot at second base after being brought up as a third baseman.
Yoervis Medina, SEA - Maintained a 2.96 ERA over 67 innings while serving as a relief pitcher for the Seattle Mariners. Even though he has a very high walk rate, he is a valuable part of the Mariners future and should receive a starting nod in spring training because of his minor league career as a starter and the lack of starting pitching in Seattle.
Oswaldo Arcia, MIN - Hit .251 over 378 plate appearances with 13 HRs. He posses a very strong outfield arm and made two double plays this year from left field. He may end up seeing Twin's prospect Byron Buxton beside him soon, so long as Arcia raises his batting average slightly.
Evan Gattis, ATL - Despite only hitting .238 over 372 plate appearances, Gattis will most likely see increased time at catcher next season even if Brian McCann returns to Atlanta. Gattis provided 20 HRs (projected 31 HRs if Gattis saw a full-time role at catcher) to a team that seems to value power over percentage. A sensation in April, he hasn't seen much attention since because of his low average and McCann's return.
Hyun-Jin Ryu, LAD - A former Korean star made big news in Los Angeles as he maintained a 2.97 ERA over 188 innings as a starter for the Dodgers. Behind Kershaw and Grienke, Ryu is another starter for the future in an amazing Dodger's rotation. He seems to enjoy stardom wherever he pitches because of his vast following.
Jedd Gyorko, SD - A spring training star, Gyorko made his debut under the injury of Logan Forsythe. He hit .249 over 516 plate appearances with 21 HRs at second base for the struggling Padres. A very strong fielder as well, Gyorko simply needs another season to acclimate to major league pitching to raise his batting average.
Alex Wood, ATL - Maintained a 3.16 ERA over 77 innings while serving as a relief pitcher or starting pitcher for the Braves. He started eleven games down the stretch while filling in for an injured Tim Hudson, but a bad September took him out of the rotation. Wood had the third lowest ERA in August for any rookie since 1995.