Just did a bit of research on the heaviest tennis racquet available in the market. It seems that the heaviest stock tennis racquet you can buy is the ProKennex Ki Q+ Tour Pro (325), which weighs in at around 12.3 ounces (or roughly 350 grams) unstrung. Of course, players often customize their racquets with lead tape and such, making them even heavier. But it's important to remember, a heavier racquet isn't always better - it's about what feels comfortable and complements your style of play. For some players, the weight of the ProKennex might be just right, for others it could be too heavy.
