London, UK (CNN) — If you’ve ever picked up a tennis racket and attempted to serve against an opponent, you’ll know just how hard a skill it is. It’s one thing to get the ball over the net ...

He has worked with some of the sport’s biggest servers, including former US player John Isner, who set the ATP-recognized record for the fastest serve in 2016, when he blasted a ball 157.2 mph ...

He has worked with some of the sport’s biggest servers, including former US player John Isner, who set the ATP-recognized record for the fastest serve in 2016, when he blasted a ball 157.2 mph ...

If you’ve ever picked up a tennis racket and attempted to serve against an opponent, you’ll know just how hard a skill it is.

He has worked with some of the sport’s biggest servers, including former US player John Isner, who set the ATP-recognized record for the fastest serve in 2016, when he blasted a ball 157.2 mph ...