Brenda Schultz hit a 121 I believe.<br />She was a tall, slightly overweight female from the Netherlands. Huge serve and Justine Henin-like strokes. I think she was not mentally tough enough and had problems beating the top players like Steffi, Gaby and Monica.
I think Brenda's was around 125.7, then Venus broke that at 1999 Wimbledon against Barbara Schett, and it was about 126.4? I have that on tape, with Martina Navratilova commentating and she said, "Oh my God, Venus just hit a 126 mile-per-hour serve.....Venus, you are incredible."
LOL, she is so hilarious. Anyways, on match point against Mary Pierce in Zurich 1999 (either quarterfinals or semifinals) Venus hit an ace to what is now known as the 127.1 mph bomb. <img src="wink.gif" border="0">
Brenda first hit 120 back in 1990. She later got to ~123. Venus passed her with that 125 at Wimbledon, then later passed herself with her 127.4.
Brenda's big problem was her groundies. In particular, her forehand. When she wound it up, it could go anywhere. Literally. Down the line. Crosscourt. Into the stands. Parking lot. It was, to be kind, "erratic". Her backhand was more dependable, as she largely sliced it.
She had trouble with low shots. Eventually, her back got the better of her. It's a shame, because she was one of the more delightful personalities on tour.