Topspin is one of the modern tennis player's most powerful weapons. When top exponents such as recently retired star Rafael Nadal deploy it, the ball can spin at more than 50 rotations per second.

Returning a low, skidding ball is always a challenging proposition, but it becomes even more demanding when you favor hitting your strokes with heavy topspin. Since more players are adopting ...

Even more unexpectedly, I have been able to make tennis-ball towers consisting of layers of four balls (4 n + 1) and five ...

In many ball sports like golf, football and tennis, controlling the ball’s spin is an important skill. Expert players can make golf balls curve around obstacles, launch footballs towards goal ...