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Minor leaguers who made a major defensive impact in 2017

Eric Stamets saved a career-high 24 runs this season, more than any other player in the minor leagues. Joe Camporeale/USA TODAY Sports

It's September, which means MLB rosters have expanded to 40 players. Teams that have fallen out of the race have allowed their young prospects to show off their skills, getting us excited for what they'll be able to do when they earn full playing time in the next year or two. Of course, it also means that the minor league regular season is over, so it's as good of a time as any to take a look back at the season and rank the best minor league defenders of 2017.

For these rankings, I primarily relied on minor league defensive runs saved (DRS), although I also took into account the player's position in determining where to place him. It's worth noting that these rankings pertain only to the contributions players made at the Double-A and Triple-A levels, and that the minor league DRS numbers are compared to the average major league fielder at the same position. That means that if a player's DRS is above zero, he has saved that many more runs than the average major league fielder at that position would have saved on similar balls in play.

With that in mind, here is my list of the best defensive minor leaguers in 2017.

10. Engelb Vielma, SS, Minnesota Twins