In the summer of 2020, Randy Sullivan watched a Major League Baseball hopeful throw inside the Florida Baseball ARMory. Looking at the data, collected with a TrackMan device and a mound measuring the ground reaction to the pitcher’s delivery, the ARMory staff noticed something they could improv upon the young left-hander’s change-up. A small tweak, they thought, could go a long way. Then a bit of doubt crept in. “Wait, wait, wait,” Sullivan recalled thinking. “We’re about to tell Tom Glavine’s son how to throw a change-up?”
Not only did the tweak help Peyton Glavine’s changeup, the individualized plan designed for Peyton helped him gain velocity. The work was crunched into just under a month. And when Sullivan shared the numbers with the Washington Nationals, showing Glavine’s baseline velocity raised from 86 mph to almost 90, General Manager Mike Rizzo’s front office signed him as an undrafted free agent in 2021. Read More about Peyton Glavine’s velo gains.