We continue our Then & Now series with a look at some of the top prospects for this summer’s MLB Draft. What did they look like before heading off to college and developing into premier prospects?

Recently we looked at:
   
+ Casey Martin, Arkansas
+ Zavier Warren, Central Michigan
+ Tommy Mace, Florida
+ Cole Henry, LSU
+ Reid Detmers, Louisville
+ Dillon Dingler & Kyle Nicolas, Ohio State/Ball State
+ Daniel Cabrera, LSU
+ Ian Bedell, Missouri
+ Trent Palmer, Jacksonville
+ Ian Seymour, Virginia Tech
+ Bobby Miller, Louisville
+ Luke Little, San Jacinto JC
+ Max Meyer, Minnesota
+ Patrick Bailey, North Carolina State

Today, we take a look at Michigan State fast-riser Mason Erla.

THEN SUMMER 2014: Six-foot-4, 180 pound long and lanky prospect with a high ¾ arm slot and good body control. Keeps his...