Tennis balls legacy can be traced back to the 12th century. In Scotland, in the 15th century, Tennis balls were made from leather stuffed with hair or wool. The stomach of a sheep or goat that was wrapped with wool and tied with rope. Later in the 18th century, strips of wool were wound round a nucleus made of cork. Cork core Tennis balls with cloth covering are still used in the original game of tennis, known as Real Tennis.
1870 brought a change again, as vulcanized rubber was first used to manufacture tennis balls. Improvements were being made,by wrapping flannel around the surface of the ball. Later, felt was used on the exterior. Pressurized tennis balls are being used today.
Yellow Tennis balls were introduced in 1972 as “Optic Yellow” as it was the easiest color to be seen on color television sets. Before then most balls were colored white or black, depending of the colour of the court. I remember playing with white Tennis balls.
The surface of the ball affects the speed and flight path. Fluffed up fuzz will decrease the ball’s speed. Pro tennis players are fuzzy and demand several balls before finding the right one. Players are looking for a ball that has the greatest amount of fuzz laying flat against its surface.
If you are unsatisfied with your serve, blame the fuzz.