Andy Roddick, Roger Federer and Rafael Nadal all have their unique serves. But what is common between them is that they all hit the ball very hard. As a spectator, you are not able to see how the tennis ball faces the brunt of this brute force with your naked eye.
However, this video will show you how the tennis ball contracts in the immediate aftermath of being hit by a racket.
The slow motion video depicts how the ball almost gets swallowed up by the racket before being dispatched at 142 kmph.