Born in Virginia Beach, Jack Wynkoop attended high school at Cape Henry Collegiate and eventually went on to the University of South Carolina to play his college baseball. While at South Carolina, Wynkoop started three years before ultimately being selected by the Colorado Rockies in the 2015 draft.
Jack Wynkoop was impressive at South Carolina. He appeared in 50 games, making 41 starts and finishing with a top notch 3.09 ERA. After hearing his name called by the Colorado Rockies, Wynkoop was off to the club’s Low-A team, the Boise Hawks.
In Boise, consequently his first professional season, Wynkoop appeared in 11 games, making nine starts. Across that time, he posted a respectable 4.25 ERA, finishing with a 2-4 record. Still just 21 years old, it was nonetheless impressive and gave Wynkoop something to build further on as he headed for his future.
The following season, Wynkoop improved tenfold while at Class-A Asheville and High-A Modesto. First, while at Asheville, Wynkoop started 14 games, pitching to a 3.47 ERA over 93 innings. Following that, Wynkoop’s encore saw a drop in ERA to just 2.68 over another 14 starts and 77 innings. During this time, he increased his strikeout rate while simultaneously decreasing his walk rate. In this time, Wynkoop finished with a collective 3.11 ERA.