By Caroline Cheese
BBC Sport at Wimbledon
Jankovic will face Tamarine Tanasugarn in the fourth round
Second seed Jelena Jankovic saw off the challenge of rising Danish star Caroline Wozniacki at Wimbledon - despite struggling with a knee injury.
Jankovic looked like she might join Ana Ivanovic and Maria Sharapova on the sidelines as she struggled to contend with Wozniacki's brutal groundstrokes.
The world number three was broken twice as she lost the first set, during which she also picked up a left knee injury.
But Jankovic finally got the measure of the 17-year-old, winning 2-6 6-4 6-2.
The Serb will face 31-year-old Tamarine Tanasugarn of Thailand in the fourth round, with a possible quarter-final against Venus Williams awaiting after that.
Jankovic is now the highest seed left in the women's draw following the shock exit of top seed and fellow Serb Ana Ivanovic on Friday.
I had to ignore physio - Jankovic
She was relieved to come through against Wozniacki, the 2006 junior champion at Wimbledon and a potential future star of the women's game.
However, Jankovic appeared more concerned with the knee injury she suffered as she chased down a backhand out wide.
"I slid and made a really strange movement," she told BBC Sport.
"As the play went on, I started to have some pain in my knee. I was struggling at the end especially.
"The physio told me I probably strained it and she taped it but I couldn't move with tape, so I took a risk to play without it.
"The physio wasn't happy about that but I had to do what I had to do to win the match. I'll have to see how it reacts when I cool down. I'm hoping for the best."
Wozniacki looked capable of causing yet another upset at Wimbledon, following the shock exits of Ivanovic and Maria Sharapova.
In an absorbing first set, the teenager forced Jankovic into a host of errors with the depth of her groundstrokes.
The world number 30 took the set at the sixth opportunity when Jankovic hammered a backhand beyond the baseline.
Jankovic hit back immediately, breaking in the opening game of the second set, but Wozniacki had chances to get back on level terms.
However, once the teenager had seen two break points come and go at 3-4, she appeared to lose heart.
After levelling the match, Jankovic took a three-minute injury time-out to have her knee strapped and later had the tape removed after complaining of being unable to move properly.
But though the world number three was moving gingerly in between points, her groundstrokes were still causing plenty of damage and she came through the third set with ease.