Jankovic fought off No. 5 Vera Zvonareva of Russia 6-4, 2-6, 6-4 in the women's semifinals, while the unseeded Sela downed No. 7 Rainer Schuettler of Germany 6-3, 6-3 on the men's side of the ATP-WTA event.
Sela will meet either second-seeded Andy Roddick or unseeded Bjorn Phau. Jankovic will play either Svetlana Kuznetsova or home favorite Zheng Jie.
If Jankovic wins the tournament, she will pull within 21 points of No. 1 Serena Williams in the WTA rankings. That will set up a showdown next week in Stuttgart, where Williams, Jankovic and six other top-10 players are entered.
Sela beat two highly rated Spaniards to reach the semifinals - David Ferrer and Tommy Robredo.
The 92nd-ranked Sela can become the first Israeli to take an ATP singles title since Amos Mansdorf in 1993. The last Israeli to reach a singles final was Harel Levy at Toronto in 2000.
"This match today was on TV in Israel,'' Sela said. "I'm getting a lot of phone calls, all the newspapers, TV.''
The Israeli started his run with two weeks of practice before last weekend's Davis Cup victory over Peru. Sela won his two singles matches and has kept his good form in China.
"I felt very good in practice and in the matches for Davis Cup,'' he said. "I felt very good coming here, and I think I have played very well.''
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Sela upsets No. 1 Ferrer; Roddick advances
Roddick into semis; Zheng upsets Ivanovic
