Baseball Savant’s Spin Mirroring Tool and the Blue Jays’ pitchers

Baseball Savant unveiled a new tool last week, spin mirroring. With Hawk-Eye cameras installed they are able to measure the direction of pitch spin. With this information we are able to see how pitches play off of each other or “mirror.” Mike Petriello at MLB.com wrote an introductory piece on this, explaining what this is and how it works. I would highly recommended reading that if you haven’t already.
With this tool, I took a look at few Blue Jays pitchers who jumped out to me.
Who needs Velocity?
Hyun-Jin Ryu’s first season with the Blue Jays went about as well as anyone could have hoped. He made 12 starts, had a 2.69 ERA, finished third in the AL Cy Young Voting and helped the team reach the postseason for the first time since 2016. Ryu keeps hitters off balance with a five different pitches, which he can throw anytime in any count. With spin mirroring we can further see how those pitches move and why they are so difficult for hitters to pick up.

On the left we have the spin-based movement by pitch type, which is the spin of the ball coming out of the pitchers hand. It’ …

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Author: Paul Berthelot / Blue Jays Nation

What Bo Bichette’s defence says about the Blue Jays and Vladimir Guerrero Jr.

Last month Statcast unveiled their new defensive metric Outs Above Average. With that came some interesting numbers on the Blue Jays infield. Vladimir Guerrero Jr. to no one’s surprise was at the very bottom of the list. What did surprise was how well Cavan Biggio ranked coming in among the top 30 and top five at second base. What intrigued me about this was player positioning, where did infielders typically line up and what does that say about the other players around them?
What follows is a leaderboard, courtesy of Baseball Savant, of the average start position of shortstops last season, sorted by angle.

 
The angle is based on home plate, whereas the third base line is -45°, up the middle is 0°, and the first base line is 45°. For a shortstop the lower their angle is the closer they are to second base. This leaderboard is showing the 15 shortstops that started the closest to second base last season. The 11th ranked player is blacked out for now, I am quite certain you know who that is given the title of this post, but we will get to that later.
There is a lot to be …

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Author: Paul Berthelot / Blue Jays Nation