How fast does a professional forehand travel, in miles per hour?

How to get close to this number

Use the serve as your anchor and work down. Serve speeds are announced on screen at every professional match, so most people have a reliable number in their head for the fastest shot in tennis. A forehand is struck from a moving position, off a ball that is already travelling, and with a swing path designed to generate spin rather than pure pace — so it has to come in well below the serve. Knowing the ratio is roughly two to three gets you there.

The mistake is treating ball speed as the measure of a good forehand. It is not, and this is the most interesting thing about the figure: the shot that wins points is not the flattest and fastest but the one with enough rotation to dip inside the baseline and kick up out of the opponent's strike zone. As the explanation notes, the modern game is won on revolutions rather than on miles per hour.

Read this as an average for elite play, not a ceiling. Individual shots vary enormously with court surface, ball condition, whether the player is attacking or defending, and where in the rally the shot falls. Tracking systems also measure at slightly different points in the ball's flight, and since a ball decelerates from the moment it leaves the strings, the measurement point alone can move the published number.