Baseball America report on newly acquired Bryan Baker
An 11th-round pick out of North Florida in 2016, Baker switched from starting to relieving last year and has progressively added velocity pitching out of the bullpen. He began this season sitting 93-95 mph in relief at high Class A Lancaster, jumped to 97-99 mph as the summer went on, and in his last outing touched 100 and 101 mph. Baker blows hitters away but is still learning to control his newfound power. He has a strikeout rate of 11.6 per nine innings but has also walked 6.8 per nine. Baker also throws a slider, changeup and cutter, but it's his fastball that is his bread-and-butter and what will take him up the system.
https://www.baseballamerica.com/stories/rockies-fortify-bullpen-trade-with-blue-jays-for-seung-hwan-oh/