Change Is Hard-Won in MLB, Even When It Tries
When Major League Baseball introduced a new, more aerodynamic baseball during the second half of the 2015 season, the changes were dramatic. By 2017, home runs had increased by 35 percent, leading to an all-time single-season record. That was enough to trigger an investigation by a team of scientists commissioned by MLB itself.
The league claimed it did not change the physical properties of the baseball intentionally. That begs an important question: how dramatic is the difference when MLB does change the ball intentionally?