In 2006 Pitch F/X was introduced. Since its inception no MLB pitcher has ever finished a season averaging over 100 MPH on his fastball. Enter Aroldis Chapman and his current average of 100.3 MPH.
According to BaseballSavant.com, there have been 14 Major League pitchers who have reached 100 mph this season on a combined 469 pitches. Entering Sunday, Chapman had thrown 325 of those pitches. He had thrown 767 pitches over 43 appearances, meaning 42 percent of his total pitches have been 100 mph or higher.
He already made history earlier in the year when he set the MLB record at 40 for number of consecutive appearances with at least 1 strikeout. That record had been held by Bruce Sutter when he fanned at least one batter in 39 straight appearances. He also set his baseball history in his rookie season with the fastest pitch ever recorded in a MLB game, clocked officially at 105.1 MPH.
Not only that, but among qualified relievers, Chapman is blowing by (pardon the pun, but I could not resist) the competition in strikeout rate. His 52.1 percent K-rate is nearly 11 percent higher than that of noted flamethrower and Atlanta Braves closer Craig Kimbrel who is in a distant second place and 11.5 percent higher than the third place finisher Andrew Miller of the Baltimore Orioles.
Chapman has done all of this after having a titanium plate inserted in his forehead after being hit in the head by one of his own mighty fastballs off the bat of Kansas City Royals catcher Salvador Perez in a spring training game. You can learn more about that incident at this link http://baseballbabble.com/chapman-hit-line-drive-game-called/. Remarkably it only cost him the first 6 weeks of the regular season. A season in which he owns a 2.44 ERA with a 87/19 K/BB ratio in 43 1/3 innings. He’s 29-for-31 in save opportunities.