Spring Scouting Notes: Kevin Maitan, a Rockies Breakout Reliever, and More
Recently, I posted notes on Cleveland ace Corey Kluber to give readers some idea of what a pitcher of such obvious talent looks like on a scouting report. Well, I recently ran into Rockies righty German Marquez — a 55 FV on his final FanGraphs prospect list and a 2.5 WAR pitcher as a rookie (which is a 55) — so here’s a similar rundown.
Marquez’s body looks like it’s backed up a bit, but he was still generating premium velocity with ease, sitting 94-96 with his fastball throughout my viewing. It, along with his low-80s curveball, is comfortably plus, and he threw several 70-grade curveballs. Marquez is clearly working on developing two other pitches — an upper-80s slider and mid-80s changeup — that are both below average right now. The change has promising movement, Marquez just lacks feel for it.
Marquez barely threw anything other than his heater and curve last year and was able to succeed anyway because they’re both excellent. If a tertiary offering is his focus this year, it’s reasonable to expect some growing pains and regression, though this is probably best for his long-term development. His fastball velocity has fluctuated a bit this spring (as low as 92 in other outings), but that’s to be expected.
He’s not technically a prospect, but Rockies righty Jairo Diaz looks poised to make an impact in the bullpen this year. Diaz missed all of 2016 and most of 2017 due to Tommy John, but his stuff has been vicious this spring. In two looks at him, Diaz has been 96-99 with a plus slider in the 87-90 mph range.