However, some say that John Isner's 157.2 miles per hour (253 kilometers per hour) serve in the 2016 Davis Cup is the official fastest serve because it was recorded using the same equipment as Grand Slam games.
I played fast pitch softball and the pitcher is closer and the ball is bigger. Too fast for me. How they do it is amazing. Just comparing two sports.

...they'll hit it.
I know a guy who was fast tracking to the majors with the Padres. Double A at 19.
99mph fastball, wicked slider, & a change up. His fastball naturally tailed into a rightie.
He had to have TJ surgery. Fully recovered. Hit 100 on the gun.
No lateral movement anymore on that heater, less drop on the slider. Major league dreams over, because now he was a fast pitching machine.
He played on an independent league team for a years and struck out 180 guys in 101 innings! But, none of them were ever going to make the majors.
I felt so bad. He's a nice guy, humble; a self-effacing hulk of a guy. He's a floor manager at a cold storage warehouse now.
But, good major leaguers will catch up to a pitch, no matter how fast if it stays straight.

IOW all of you. The faster the pitch the farther it will go if hit??