China's Zheng Jie reached the semi-finals of the Birmingham WTA grasscourt tournament on Saturday, but torrential rain left organisers with a nightmare backlog of matches.
Zheng got the better of Italian fourth seed Roberta Vinci 6-3, 5-7, 6-4 in a quarter-final already held over from Friday.
Jankovic was leading 2-0 in the opening set when the weather intervened.
The Russian will now take on either Melanie Oudin or Irinia Falconi.
Oudin led her American compatriot 6-4, 5-7, 1-0 when play was called off to leave organisers trying to squeeze two quarter-finals, semi-finals and the final into Sunday.
Source: AFP Global Edition