Wicked spin, radar control, tough as nails—the virtues of polyester string are well documented. With such qualities, it’s no wonder the popularity of polys has grown at every level of the game. One of ...

Whipping his racquet through the air like a cesta in jai alai, Rafael Nadal produces such tremendous topspin that the ball sometimes seems to catapult off the court, creating a shot as challenging to ...