The world number 5 Indian shuttler, who won the title back-to-back in 2009 and 2010 before losing the crown last year, had little difficulty in disposing off her unseeded Korean rival 22-20 21-18 in the women's singles semi-final, which lasted exactly 50 minutes.
Saina will face fourth seeded Xuerui Li of China in the summit clash tomorrow. Li stunned top seed and compatriot Yihan Wang in the other semi-final.
The road to the third Indonesia Open title won't be easy for Saina as she holds a dismal 1:4 head-to-head record against Li.
The day, however, witnessed mixed results for India as earlier another Olympic-bound Indian shuttler P Kashyap failed to cross the semifinal hurdle of the Super Series Premier event, losing 15-21 12-21 to world number nine Simon Santoso in a 46-minute men's singles match at the Istora Gelora Bung Karno Stadium.
Contrary to the final result, Saina looked a little sluggish against Sung initially, especially after her energy-sapping quarterfinal contest against world no. 4, Shixian Wang of China yesterday, which lasted one hour and 37 minutes.
But as the match progressed, Saina picked up her game and played well enough to secure a place in the final.
To Saina's liking, Sung was erratic and committed numerous unforced errors that worked in the Indian's favour. More