Tennis Warehouse has a string performance tool that allows players to evaluate strings based on their stiffness level, which is the key spec for determining how arm friendly a string is likely to feel. The tool’s data is culled from a machine constructed by the authors of “The Physics and the Technology of Tennis,” Crawford Lindsey (“TWU Professor”) and Rod Cross, physicist from the University of Australia. Using this tool, I have assembled the following lists for the player in search of a more arm friendly control string. I have limited my focus to poly-based monofilaments.
Softest Round Polys
*Please note: poly-based strings are generally stiffer than their nylon and natural gut counterparts. The strings above should not be considered arm-friendly compared to these softer material classes, rather, they should be considered more arm friendly than their poly-based peers. Finally, while lab data is useful and should be used as one part of your evaluation, your on-court experience may not always cohere with lab results. Let your arm be the final judge.