Olympic bronze medallist Saina defeated Sung 19-21 21-14 21-19 in an energy-sapping women's last-eight match at the Siri Fort stadium.
There was hardly any winner in the grueling three-game match as each rode on the other's unforced errors.
Saina, who has beaten Sung five times in the past used her drops early on to catch the Korean at the forecourt.
However, unforced errors and a few deceptive returns helped Sung to lead 8-4. The Indian showed her resilience to claw back at 10 before a shot from Sung left her stranded.
Another return going to net and then failure to retrieve a shot at the right side gave Sung a 20-17 lead. Saina saved two but left the next thinking it will drop inside the line.
In the second game, Saina lead 3-1 when Sung took a break to attend to her right ankle. When the match resumed, Saina continued her good run to lead 6-2.
After the interval, Saina extended the lead to 13-8 and then zoomed to 19-10 with the Korean crumbling. Sung grabbed three points before another long shot gave Saina a 20-13 lead. The Korean saved one but Saina roared into contest when Sung failed at the net.
In the decider, Sung lead 5-2 early on but she faield to rein her unforced errors as Saina soon turned it around at 8-6. The Korean looked visibly tired as she didn't even try to retrieve some of the shots as Saina reached the break with a 11-7 advantage.
Two wide shots from Sung brought Saina to an even-knell at 17-17 befroe he grabbed the lead when the Korean erred at the net.
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After the match, Saina said she didn't expect it to be such a tough match as she always had easy outings against Sung.
"She has played really well. I didn't expect her to do so many rallies actually. She was picking up my shots. The last moments were actually very tense. It has always been easy against her. It was never such a long match. Once I think in Denmark I guess we played close. This time it was totally different. But I guess there is lot of pressure also now on me. I am happy with the way I played," she told reporters.
"I said earlier I need some match practice to get to my best. I will need some more time but I am happy that I am being able to pull out my matches. "
Asked about the importance of defending ranking points in the run up to the Olympics, saina said, "The semis is a good enough result so no tensions now. The main focus will be to win tournaments and not to think about the ranking points.
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