John Isner
#1 · Fastest ATP-recognized serve · 2016 Davis Cup
Tennis
249.4 km/h serve, the ATP bio's 155 mph, in a 2004 Davis Cup tie.
Ball speed
Published as 249.4 km/hPublished as 249.4 km/hPublished as 249.4 km/h
Serve timed at 155 mph in a 2004 Davis Cup tie, the figure on Andy Roddick's ATP bio. 155 mph converts to 249.4 km/h. Tennis Companion prints 249.4 km/h (155.0 mph). Wikipedia's table prints 249.4 km/h (155 mph). No calendar day is stored.
In context
Worked out from the sourced figure above, which stays the ranked number.
This list
An ATP or Davis Cup serve is a kinetic chain. The legs, the trunk and the shoulder load, then the racquet head meets the ball. The list keeps the radar figure those events printed.
Serve speed is the racquet head at contact, not a practice swing. The toss has to sit where the chain finishes.
This list is ATP Tour and Davis Cup radar. A Challenger clock, even a faster one, is a different scope and stays off the ranking.
This is how the category works. A note written for this entry appears here once it is in the database.
Provenance
Claimed, measured and official figures side by side, each with its source. The ranked figure is marked.
Serve timed at 155 mph in a 2004 Davis Cup tie, the figure on Andy Roddick's ATP bio. 155 mph converts to 249.4 km/h. Tennis Companion prints 249.4 km/h (155.0 mph). Wikipedia's table prints 249.4 km/h (155 mph). No calendar day is stored.
Sportskeeda's heading prints 249.4 km/hr for the 2004 Davis Cup and its sentence rounds the same serve to 249 kmph. The ranked figure is 249.4 km/h.
Reference
Context
Andy Roddick's ATP bio says one serve was timed at 155 mph in a 2004 Davis Cup tie. Tennis Companion prints 249.4 km/h (155.0 mph) for that Davis Cup. Wikipedia's table prints 249.4 km/h (155 mph) at the 2004 Davis Cup. 155 miles an hour is 249.448 km/h, which those tables print as 249.4.
The ranked figure is 249.4 km/h. A Sportskeeda sentence rounds the same Davis Cup serve to 249 kmph, beside a heading of 249.4 km/hr. That rounding is not a second serve. No calendar day is stored.
Every report is read by a person, and corrections are dated on the page.