Get a grip.
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Despite the array of grip machinations in tennis, the eastern grip – in which the base knuckle of the index finger is right on bevel No. 3 – is the one used to deploy fast, flat serves and forehands controlled with topspin. 

"You have to have that eastern grip if you want a massive serve," Williams explains, adding that the grip is not ideal for carrying on a rally because it offers too little control. Still, it is the best place to start.