String Check: USTA National Clay Courts 12s

Last entry I discussed the rackets that some of the best 12 and under tennis players in the United States used at the USTA National Clay Courts. But as my friend Tom Parry of Pacific has often said, “rackets are just string holders.” So what types of strings did we see? Through the first three days, it looked like this:

All Multifilament –23.5%

All Synthetic Gut –12.0%

HYBRID –35.3%

All Monofilament –29.0%

These string combinations are listed from “hardest” to “softest” in terms of the feel of the string and the amount of shock that is transmitted to the players arm. (Operationally, the United States Racquet Stringers Association defines the “stiffness” of a string as the pounds of force per inch necessary to move the string. This ranges from the softest gut at 88 to the stiffest Kevlar at over 500. Most multifilaments are in the 180-200 range, synthetic guts are in the 200-220 range, and monofilaments range from 220 to over 300.)

The stiffness of the player’s stringbed is a big concern. I know many people who have developed wrist or elbow tendonitis from using strings that are too stiff. I worry about the long term consequences on a kid’s arm of using very stiff strings from a very young age. I advise my customers – regardless of age actually — to use the softest string possible, and only move to harder strings when they begin to break strings more frequently than they can afford.

I was happy to see, therefore, that less than a third of the players were using all monofilament string jobs and slightly more than half were using all multifilament or all synthetic gut strings. The largest group of players were using hybrid strings (stiffer monofilament strings on the mains and softer strings on the crosses), which is a good compromise for people who play and break strings frequently.

Interestingly, one of the tournament sponsors, Babolat, gave each player a free pack of RPM Blast 17g. That is 128 sets in total, which is quite generous. I am not certain, however, that it is a good idea for 10, 11, and 12 year olds to be using all-RPMs. I often hear people characterize RPM as a “soft poly.” It is actually a very stiff sting (rated at 280 pounds). What people react to, I believe, is that it is more elastic than other earlier generation monofilament strings, giving it better “feel.” But the fact that it has more elasticity doesn’t mean that it won’t transmit a good deal of shock to the arm of a 11 year old kid. I just strung a Babolat Pure Drive with RPM at 62# and wonder about the long term effect of that on the player’s physical well-being. He did complain about shoulder pain after one of his matches and said (joking perhaps, though perhaps not) that he was going to drop 10# on his rackets after the tournament.

Speaking of tensions, almost one-quarter (23.5%) of all of the players we strung for were at 59# or higher, though some of those were stringing with all multifilament strings. The same proportion were stringing at 54# or lower, which I think is a good ceiling for most players (sting low!). No player strung below 50#, though. The majority of players strung between 55# and 58#, with the single most popular tension being 55#. In general, I found the string tensions reasonable in combination with the types of strings people were using.

In the end, I would say the “typical” racket being used by the players at this tournament was a Wilson with hybrid string job at 55#.

The most unique request was for a 9 year old player using a Wilson K-Blade junior model. The mother dropped off the racket and said she didn’t know the tension range, so I was going to string it at the middle of the range with a Gamma multifilament. She came back a moment later and said the kid’s coach texted her the tensions for the racket: 51.5# on the mains, and 50.5# on the crosses!



  1. Justin Warshavsky · December 8, 2011

    I would assume that a soft poly with tension in the mid to low 50s would be ideal for a younger player. This would give the player access to enough spin and power with no strain on the arm. Correct me if I am wrong?Justin WarshavskyEndicott College Tennis (class of 2015)


  2. Big Time · December 8, 2011

    Thanks for your comments, Justin. To your question, I think it depends on the specific player, but I believe that even the low to mid-50s with all-poly is hard on most younger players' arms. I think most 12 and under players can get sufficient spin and power with a hybrid string job, and only a few are big and strong enough to need all-poly. I do like your idea of stringing looser rather than tighter, though!


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