This did not catch on when introduced in 2002 because the problems it was intended to address, such as nullifying the power of the big servers, were soon being solved in other ways.

在2002年刚推出的时候并没有被广泛运用，因为那时候推出这类球的主要意图是抵消大力发球的球员产生的力量，但很快这个问题就以其他形式被解决了。