South is the current British number four
Britain's Melanie South reached the third round of the DFS Classic with a gutsy 6-3 7-5 win over Sybille Bammer.
The Surrey 22-year-old displayed great courage to oust the Austrian fourth seed in a match in which there were twice as many service breaks as holds.
The British number four twice fought back from 0-40 down to hold serve as she beat the world number 28.
She was also confirmed as a Wimbledon wildcard entry with Elena Baltacha, Katie O'Brien and Naomi Cavaday.
South said: "I don't feel I served that well but I fought really hard and returned well. I kept being aggressive because I wanted to win it in two sets and not go to a third."
South will now play Japan's Aiko Nakamura or Israel's Tzipora Obziler in the third round on Thursday, hoping to emulate Sue Barker - the only Briton to ever reach the quarter-finals in Birmingham.
British number Anne Keothavong crashed out in the first round, beaten 6-3 6-2 by 12th seed Kateryna Bondarenko.
Keothavong converted only one of four break points and dropped her own serve five times as she lost in 64 minutes.
The Londoner, 24, recently became the first GB woman in the world top 100 since 1999.
But she never looked like troubling Bondarenko after being broken in the third game.
She trailed 5-1 before staging a brief rally, breaking her opponent for the only time, but she called for help from her coach after losing the first set.
I was on the back foot and it was tough to get into the match, although there were opportunities for me
Bondarenko, who with sister Alona won the women's doubles at this year's Australian Open, was tested for the only time in the match in the fifth game of the second set.
She was forced to save two break points after missing an easy volley at the net and then double faulting for the second time.
But she eventually prevailed after five deuces and wrapped up the match by breaking Keothavong for a second time in the eighth game.
The Briton, who reached last week's Surbiton final, said: "I didn't serve as well as I would have liked and that cost me quite a bit.
"I expected it to be closer. I was on the back foot and it was tough to get into the match, although there were opportunities for me.
"But it's not the end of the world. I had a good week last week and I've got another tournament before Wimbledon so hopefully I will improve."
Keothavong plays at the Ordina Open in the Netherlands for the first time next week.