The match was a serving display for the most part, with only two breaks the whole time. Unfortunately for Ivanovic it was Hercog who got them both, one per set, and at the end of the day the Slovenian qualifier never even faced a break point on her own serve to take down the No.14-seeded Serb, 64 64.
"It was a big challenge for me to go out there on a big court and play against Ana Ivanovic, and I'm just really happy the way it turned out," Hercog said. "It's probably one of the biggest victories for me. I beat Bartoli before when she was Top 10, but Ana is on her way back so it's a very big win for me."
Hercog seems to know her career stats very well - her win against the No.14-ranked Ivanovic was her equal-second best career win, bettered only by her win over a No.7-ranked Bartoli at Charleston in 2012 and equalled by her win over a No.14-ranked Kirsten Flipkens at Québec City a few weeks ago.
The other seeds who were still stuck in the second round managed to get out of it though, first No.8 seed Jelena Jankovic, who looked headed for a straightforward win as she led 63 31 but had to grind out a 63 57 63 win in two and a half hours against Kazakhstani qualifier Galina Voskoboeva.
"I played her at Wimbledon a few months ago, so I kind of knew what to expect, especially the big serve," Radwanska said. "We played a really long three set match there. She was really serving unbelievable. So I knew I had to stand two steps backwards to reach that serve. But I don't think her percentage of first serves was as good as the matches before - it was a little bit easier for me today.
"But she's one of the youngest talented players coming out. Last year I was asked me to name which of the players can be the most dangerous to the top seeds, and I actually said it's Madison Keys, because she can play very good tennis. In a couple of years we're going to see her more often."
"This is the first tournament that I've been able to really keep up my intensity and keep up my focus. I think I've played two good matches," Petkovic said. "Personally it's really important to see that I can still beat the players on the top level, two past Grand Slam champions. It's just a big boost for my confidence, no matter what happens now in the future. So I've been really satisfied with my game."