How much topspin in tennis is considered good for an amateur player? I hit with an average of 1,400 rpm with a max of around 2,500 rpm. - Quora
When the speed of the tennis ball is measured in tennis matches, is it directly measured, or is it based on the time and distance between the ball hitting the two players'
![Firstpost Explains: What is a Smart Ball – the 'ball with a microchip' – set to be used for first time in professional league? - Firstcricket News, Firstpost Firstpost Explains: What is a Smart Ball – the 'ball with a microchip' – set to be used for first time in professional league? - Firstcricket News, Firstpost](https://images.firstpost.com/wp-content/uploads/2021/08/Smart-Ball-with-chip-pic-NEW-640.jpg?impolicy=website&width=1200&height=800)