The soon to be world number one tennis player Jelena Jankovic has defeated Vera Zvonareva at Stuttgart's WTA event.
The gritty 7-6, 7-6 quarter-final win against the Olympic bronze medalist books the Serbian a semi-final with Venus Williams.
Jankovic will regain the world's top ranking next week after the other Williams sister, Serena, lost in the second round.
Russia's Nadia Petrova will face Victoria Azarenka of Belarus in the other semi-final.
