The main rule with grip size is that you want a handle big enough so that there is some space between the tips of your fingers and your hand (like the image on the left). If your fingers go all the way around the handle and run back into your hand (like the image on the right), you need a larger grip size.
In respect to this, what is the most common tennis grip size?
4-3/8
Beside above, does tennis racket grip size matter? The right grip size makes a huge difference in how a racquet performs. … If there is space between your finger and palm, the grip is too big. A too-small grip requires more muscle strength to keep the racquet from twisting in your hand. Prolonged use of a grip that’s too small can contribute to tennis elbow problems.