The Cubs took righty Paul Richan in the second round of the 2018 MLB draft and he debuted quickly with quite a bit of work for the Eugene Emeralds. The San Diego product pretty much dominated Northwest League hitters by flashing an excellent curveball and a plus changeup, but his fastball needed some work. Rather than the 95 mph advertised by his scouting reports, it sat 88-91.
The velocity drop was a bit alarming, but RIchan had already completed a full season in college and began his pro career after a six-week layoff. That could not have been easy on his arm and may explain the fastball issues.