Rafael Nadal hits with power.
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Modern technology usually favors smaller and lighter devices over bigger and heavier ones, and that carries over to tennis rackets; manufacturers have striven to develop lighter rackets for decades, ever since Wilson significantly reduced racket weight from an average of 12 to 13 ounces before 1990 to 10 to 11 ounces today. Some rackets weigh even less than 10 ounces. Still, some players find that heavier rackets -- those between 11 and 13 ounces -- have certain benefits for their game that light rackets can't match.
Though you can win tennis matches through finesse, you need power to compete against the best players. As USPTR tennis instructor Ron Waite said, "Power in the modern game is essential!" A heavier racket produces power. If you need proof, look to physics: power equals mass times velocity. But the caveat is you need sufficient muscles to propel a heavy racket with the speed needed to generate power. You can build your muscles off the court, but just by playing with a heavier racket, you can develop your muscles.
Power is important, but it means little if it isn't accompanied by control. Heavier rackets give you more stability, and the more stable the racket, the less the impact of the ball affects it. That leads to better control. This type of control is not the same as maneuverability, however. Lighter rackets are easier to maneuver.
Transmits Less Shock
If you have tennis elbow, it's best to use the heaviest racket you can comfortably handle without becoming fatigued during the match. A light racket will feel good initially when you pick it up and first hit with it but, because it is so light, it won't absorb the shock of the ball as much as heavier rackets do. That means your arm will absorb more of the shock, which is not good for tennis elbow. If you prefer a light racket, you can always get one and make it heavier by adding lead tape to the frame.
Good for Baseliners
Heavy rackets help generate powerful baseline strokes, which is ideal for singles players or for doubles players who stay back. Contrast that with lighter rackets that are easier to maneuver. Easy maneuverability is nice, but it comes in handy mainly for volleys, serves and overheads. Though serving is a big part of the singles game, volleys and overheads are more likely to be used as a matter of regular play in doubles. So if most of the shots you hit during your matches are from the baseline, you will probably prefer a heavier racket.