Pros know the impact that small tweaks to a racquet can have on their game (in 2012 Tommy Haas visited Head's Austrian headquarters, made a few adjustments to his stick, and promptly won the Gerry Weber Open).
Now, thanks to Head's Custom Made program ($400), you can get the same advantage. Start with the base model, the No. 1-selling Graphene Speed (Novak Djokovic swings it), then fine-tune the weight (to the gram); length (to the millimeter); balance (head heavy or head light); grip size, shape, and type (leather versus two synthetics); and string pattern and tension. It takes six weeks for an engineer in Austria to make it (better than its being mass-produced in a Chinese factory). Tips from Andy Murray and Maria Sharapova can help guide you through choosing the right metrics—which can mean the difference between hitting a winner and hitting the net.
Also on Details.com:
Way Beyond the Wristband: Crazy-Smart Fitness Trackers Now in Basketballs, Tennis Rackets, and Bikes
The Ultimate Tennis Workout: How to Get a Grand-Slam Body (Without Lifting a Racquet)
5 Running-Shoe Myths—Busted