 However, a player's overall power level may decrease due to the need to moderate ball striking effort to reduce discomfort and even injury.Although known as a hard hitter in her younger years, in her 40s she was known more as a precision player who used finesse (and especially tactics) more than power.In fact, the last doubles partner she won a major with in mixed, Bob Bryan, remarked on how slow her serve was, despite how effective she was on the court.