Schultz-McCarthy, who is 6ft 2in tall, finally beat the Italian Gloria Pizzichini, who is just over five feet, 6-7, 6-3, 6-3 to reach the quarter- finals of this Wimbledon warm-up event.
Pizzichini, ranked 52 in the world, 42 places below her rival, won the first set after losing a 5-2 lead and then, at 3-3 in the second set, had three break points.
"That was the turning point," Schultz-McCarthy said. "If I hadn't saved those break points it would have been very difficult because on these courts it is hard to break back. But it was a good match for me to win for not many people return my serve as well as Gloria did today."
Schultz-McCarthy has the fastest serve in the women's game and was timed at 121mph at the Australian Open in January. But she hopes to be a bit quicker at Wimbledon.
Though the third-seeded Natasha Zvereva, struggling with a knee injury, was crushed 6-1, 6-0 by American Meredith McGrath, the big surprise of the day came when Lori McNeil, the sixth seed, was beaten 6-3, 1-6, 6- 3 by Germany's Christina Singer.
McNeil, who beat Steffi Graf in the first round at Wimbledon two years ago, won this tournament in both 1993 and 1994 and was runner-up last year.Reuse content