But her serving has been causing mayhem at the receivers ' end .
The 18 aces in 112 attempts , for an average of . 51 per set , see her solidly at the top of the Best Servers .
But her serving has been causing mayhem at the receivers ' end , and the 18 aces in 112 attempts , for an average of . 51 per set , see her solidly at the top of the Best Servers .