After Han held in the first game of the match, the No.1-seeded Jankovic reeled off those nine games in a row to build a 6-1, 3-0 lead, and she never really looked back en route to a 6-1, 6-2 victory.
"I was feeling tired physically. Some of the points were so long and the rallies were tough," Jankovic said afterwards. "But I just tried to get every ball back and I'm really glad to make the final here.
"I'll try my best tomorrow and hopefully I can come away with the title here!"
Jankovic is going for her first title of the year, and the first WTA 125K Series title of her career.
Standing between Jankovic and that first will be Chang Kai-Chen, who battled for two hours and 50 grueling minutes to outlast Lu Jia-Jing in the other semifinal match of the day, 3-6, 7-6(3), 7-6(3).
Lu had her chances - she was originally up 6-3, 5-3, and after Chang battled back to push it to a third set, the Chinese even went up 5-3 in the third set, bringing up a match point on Chang's serve.
But Chang never stopped fighting and battled back to win in a third set tie-break.
"She played really well today and put me under so much pressure," Chang said afterwards. "It was quite different from the last time we played in Korea, but fortunately I won this tough match eventually!
"The most important thing for me now is to rest and recover mentally and physically. I really look forward to playing Jankovic tomorrow. I'll have to be patient. It will be a much different game."
Jankovic beat Chang in the pair's only previous meeting, at the Australian Open three years ago.
Chang will be going for the biggest title of her career - until now her biggest career title came at a $50,000-level ITF Women's Circuit tournament back in 2011, on the hardcourts of Kofu, Japan.
But don't let her No.191 ranking fool you - Chang has had some big-time wins in her career. In fact she's an even 3-3 against Top 10 players, scoring wins over then-No.1 Dinara Safina at Tokyo in 2009, then-No.10 Marion Bartoli at Guangzhou in 2012 and then-No.9 Samantha Stosur at Osaka in 2012.
Jankovic, a US Open finalist and former No.1, is currently ranked No.25 in the world.