Leyson Septimo faced three batters and threw 15 pitches total. Only seven of those were fastballs, which is an unusually low total for him. Those heaters ranged from 94-96 MPH. Septimo's offspeed stuff ranged anywhere between 80-87 MPH, which is a significant differential from his four-seamer. While his slider did not show much movement, Septimo was able to throw both it and his changeup for strikes.
Pedro Alvarez singled off one of those sliders to allow an inherited runner to score, but it was on a hit that did not leave the infield. Septimo then got Chris Heisey and Tyler Flowers to strike out swinging - Heisey on a slider and Flowers on high heat. The fact that Septimo was able to overmatch such vaunted hitting prospects using a 50/50 mix of fastballs and secondary pitches bodes extremely well for his future.
The PitchFX system was first installed and implemented in MLB stadiums in 2006, and it has been running for every major league game since opening day, 2008. It uses cameras to track the speed, movement, and location of every pitch in precise detail. Radar guns do not provide very accurate readings, as they pick up extraneous movement from the pitcher's arm and the bat, only picking up an estimated speed of a pitch once, in the middle of its delivery and after it has already decelerated. The PitchFX system takes multiple readings throughout the pitch's journey to home plate and calculates velocity accurately as distance over time.
Discuss this story on the all-new FutureBacks.com subscriber-only message boards.