In a match-up between two of the best movers in the game, Bouchard and Jankovic were grinding it out for more than two hours in front of a packed center court crowd, putting on a dazzling display of long rallies and some particularly impressive returning from Bouchard and down-the-lines from Jankovic.
Bouchard looked headed for a straight set victory as she took the first set and broke for 4-3 in the second set - Jankovic tightened the screws from there to win four games in a row, pushing the match to a third set, but the No.6-seeded Canadian regrouped, closing out the No.2-seeded Serb, 63 46 63.
"I started well, but then I dropped a level, and I felt a little bit flat, especially after 3-3 in the first set," Jankovic said afterwards. "I lost a couple of games in a row and let her take control of the match.
"Afterwards I was still hanging in there. I was trying to fight. I tried to move her a bit better, but at the end I felt kind of flat again. I needed to move my feet more. I needed to be more intense. It was the end of the match - you've got to push a little more. I tried my best out there, but it just wasn't enough."
Jankovic was very impressed with her conqueror, though: "She's very solid. She stays so low and takes your balls so early off the ground, so even if you hit hard, she just picks them up so easily and kind of directs them. That's her biggest strength, that she can absorb someone's ball and just use it."
Bouchard's win over the No.8-ranked Jankovic is the biggest win of her career. She had three Top 10 wins before this one, but all of them came against No.9s or No.10s (No.9 Samantha Stosur here last year, No.10 Jankovic at Tokyo [Pan Pacific] last fall and No.10 Sara Errani at Indian Wells this year).
"I knew in the second set my game wasn't where I wanted it to be," Bouchard said. "I think she did a good job of stepping in and controlling, and she changes directions a lot, so I was really on the run. And that's fine, but that's not where I want to be most of the time. I needed to get back to my game.
"I didn't really think about how I was up a break in the second, because it was in the past, and I had to move forward. I'm happy I didn't hold onto that. It was important to have short-term memory."
Petkovic has beaten Bouchard in both previous meetings, though one was almost three years ago when Bouchard wasn't really on the map, and she had to come back from 62 41 down to win the other.