How are you going to increase balls put in play without fundamentally changing the essence of the pitcher's mission while on the mound: to get the batter out (excluding trying to induce a ground ball to get a different runner out)? It's not just batters being more discriminating and trying to induce walks/high pitch counts but pirchers are throwing more breaking balls because those are more difficult to hit/put in play. There are millions being invested in decreasing a batter's chances at hitting a ball by studying how to perfect different breaking ball pitches.
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It's harder to get a hit in the major leagues today than at any time since the DH was added in 1973. Last year, for the first time ever, there were more strikeouts than hits, and more foul balls than balls in play (meaning fans had more chances to field balls off the bat than the fielders did). Hitting has become harder less because of velocity of pitches (which has hit a three-year plateau) and more because of technology, which has spawned new, actionable knowledge about pitch shaping and sequencing to better expose hitters’ weaknesses
Because pitching is proactive—baseball is the only game in which the defense has the ball, with the pitcher deciding how and where it will be set in motion—technology mostly helps run prevention, not run production. The biggest benefit is that pitchers can fix flaws and make performance adjustments almost on the fly.
In 2015 the Rays installed at Tropicana Field a markerless motion capture system made by Philadelphia-based KinaTrax. The system gives a skeletal, 360-degree readout of a pitcher’s delivery based on eight to 12 radar-tracking units installed around the ballpark. Since then the Cubs, Dodgers and Red Sox also have installed KinaTrax, which one source familiar with the system estimated cost about $1 million.
The advantage of KinaTrax is that, since it doesn’t require markers to measure kinematic movements, it provides data under actual game conditions, not bullpens or labs. Last season, for instance, the Cubs were flummoxed about what was wrong with Kyle Hendricks, who carried a 4.27 ERA into July. His velocity was down, and he had lost movement on his sinker and changeup.
Data from Trackman indicated that Hendricks’s release point was two to three inches higher than normal, but on video the angle of his arm at release looked no different than usual. Hendricks himself could feel no difference in the way he was throwing. So the Cubs consulted KinaTrax. They overlaid a 3D motion capture image of Hendricks’s delivery from a recent poor start (with skeletal points connected by red lines) over an image from when Hendricks was throwing well (his so-called “baseline” mechanics, represented in blue). Immediately the images revealed a root cause that Hendricks could not feel and that could not be seen on video: His trunk was tilting a few degrees toward his glove side as he released the ball. There was nothing wrong with his arm angle. The trunk tilt had simply pushed the arm higher, causing his pitches to flatten. The Cubs immediately corrected the trunk tilt in the next bullpen session. Hendricks’s ERA over the rest of the season was 2.65.
https://www.si.com/mlb/2019/03/29/techn ... nBRb3Nrdg..