Tyler Glasnow tops this list as the midseason callup likely to have the biggest impact in the NL in 2016 because he has the immediate potential to contribute to a pennant-chasing team. Considering the fact that Pittsburgh has fallen just 7 cumulative games shy of winning the NL Central the past three years, the ability to have a top of the rotation talent like Tyler Glasnow called up midseason is a salivating prospect for a contender like the Pirates.
It is highly probable that Aaron Blair will make an appearance with the Atlanta Braves in late May to early June and have an immediate impact. His consistent approach and ability to attack hitters will be a big improvement over the Braves current, less aggressive options. Blair figures to pair with Teheran and younger Braves prospects in the not too distant future to form the basis of the Atlanta rotation, something Braves fans have to anxiously await.
With Arcia’s fast ascension to AAA, advanced defense, and already promising hitting development, he is a candidate to take over the everyday shortstop role for the Brewers possibly as early as June. What is likely is that Arcia will make an immediate impact for the Brewers with his legs and glove, with the ability to help them even further with his bat. The Brewers do not project as a great team this year, but Arcia’s debut will be a very bright spot for an otherwise inconsequential season.
The advanced metrics indicate that Robert Stephenson might indeed be growing into a great young pitcher, and continued success and development at AAA should earn him a spot in the big leagues this year.
With Philadelphia’s current ho-hum options to play, it is not hard to picture prospect Nick Williams in the Phillies outfield of the future along with Odubel Herrera, starting as soon as May or June of the 2016 season. Williams has the bat speed and power potential to blossom into an answer for the Phillies questionable outfield.