Glasnow will be an interesting case.
Anyone browsing the web can try going to Tyler Glasnow’s baseballsavant profile page and looking at his spin rate increases, year to year. Keep in mind before interpreting the data that, at least by my understanding, there are still open questions on what a good spin rate is, or how much an increase helps, or how much of an increase should be viewed as suspicious.
Scroll halfway down (if on smartphone) to the Pitch Tracking section, then click on +View More Seasons to expand back to 2015, and keep swiping all the way right (on smartphone) until you get to the Spin column. The number for most players will usually be in the two thousands and will represent the revolutions per minute that the ball turns on the way from the pitcher’s hand to home plate.
(Also tagging @Original_JB who had similar comment on another thread)
https://baseballsavant.mlb.com/savant-player/tyler-glasnow-607192?stats=statcast-r-pitching-mlb