The Serbs are taking their participation very seriously in the tennis event at the Beijing Olympics. I would say that they do stand a better chance to win gold medals compare to any other countries.
To kick off the Olympics campaign, top tennis players Ana Ivanovic and Jelena Jankovic have received the honor to be featured on first day covers and stamps as well as their male colleagues which include Novak Djokovic, world No.41 Janko Tipsarevic, and world No.6 doubles player and Australian Open mixed doubles champion Nenad Zimonjic.
The images for these five stamps were created by academic painter Marina Kalezic.
Surprisingly, I couldn't find Jelena's first day cover on the Internet at all.
(Pictures from anaivanovic.com and ebay)