Trevor Hildenberger made two appearances for Cal-Berkeley as a freshman in 2010, was redshirted in 2011, and then had nine appearances as a sophomore in 2012. That added up to 11 games pitched in three college seasons.
He discovered the sidearm pitching action as a junior in 2013, and then set a Cal saves record with 10 as a senior in 2014. He was a 23-year-old pitcher relying on a trick delivery, not the profile for a major prospect in the 2014 June draft.
Hildenberger was taken in the 22nd round by the Twins, signed quickly, and was assigned to the GCL Twins – the rookie team in Fort Myers. He was 4 or 5 years older than a number of his teammates.
There have might been extra motion in Hildenberger's delivery, but there wasn't much wiggle room for him as far as a pro career was concerned. At his age, if he didn't get hitters out immediately, and keep getting them out, he would be back home in the Bay Area, using that Cal education in the job market.
Hildenberger had 24 appearances in rookie leagues (23 in the GCL, one in Elizabethton) in 2014 and 41 in Class A (28 in Cedar Rapids, 13 in Fort Myers) in 2015.
The results were positive and the Twins added him to their list of players for the Arizona Fall League in 2015.
I was watching the AFL championship game on the MLB Network that November and Hildenberger pitched a scoreless inning. The action and velocity on his pitches was more impressive than had been imagined.
He was outstanding for eight appearances back at Fort Myers in 2016, then was promoted to Class AA Chattanooga. He pitched in 32 games for manager Doug Mientkiewicz, with an ERA of 0.70 and a batting average against of .157.