Here is a list of the many reasons why strings break and a few possible remedies.
1. Players who hit with a lot of spin will wear through string. Extra string movement causes a sawing action where the mains and crosses meet. Return strings to their original positions between points to reduce sawing. Try a thicker gauge of your favorite string. Many of the new co-polys are designed to snap back into place after ball contact which reduces this sawing action.
2. Mis-hits or shearing near the racquet frame. Framed shots put extra stress on string and wide-body frames are notorious for shearing due to the frames extra stiffness. This causes the string to share more of the load during contact. Even today's polys will break from shearing.
3. Damaged, broken, or missing grommets. The grommet seat or portion of the frame where the grommet sits is unfinished and can be rough. String coming into contact with this unfinished seat can cause premature breakage. A good stringer will inspect your grommets and replace or tube them during stringing. The stringer may also advise you of the need to replace your entire grommet strip if necessary.
4. Worn bumperguards. After time, the bumperguard may wear down after repeatedly coming into contact with the court. This may cause the string to be exposed to abrasion during a 'dig' shot. What may look like breakage from a framed shot could very well have been damaged string due to court contact. Replace the bumperguard when the string is sitting outside of the string track. Tubing or head tape can also be used to protect string in this area.
5. An inexperienced stringer can damage string in several ways during the stringing process. Setting string clamps too tight can crush certain strings. Clamps set too loose can cause slippage during tensioning which can mar the string. Pulling crosses too quickly will cause notches in the mains, resulting in premature breakage. Inspect your string job when you pick up your racquet and make sure your stringer has not damaged your new strings. Find an experienced and knowledgeable stringer.
