Saina received a big boost ahead of her Rio Games campaign as she defeated 2011 world champion and 2012 Olympic silver medallist Yihan, seeded fourth, 21-8 21-12 in just over half an hour in the semifinals.
The London Olympic bronze medallist Indian will take on World No. 12 Sun Yu of China, who defeated third seed and compatriot Li Xuerui in another semifinals, in the summit clash tomorrow.
In men's singles, Kidambi Srikanth's fight ended with a disappointing 20-22 13-21 loss against Denmark's Hans-Kristian Vittinghus in a 43-minute semifinal battle.
Saina was at her dominating best in the opening game. She executed her plans perfectly and zoomed to a 15-6 lead against Yihan. The Indian came up with some sharp angled returns to bamboozle the Chinese. Her slices and smashes were stiff and sharper then Yihan, who seemed off-colour.
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In the second game, Saina did not allow the intensity to slip and rode on Yihan's sluggish movement and inconsistent strokes to once again open up a 11-4 lead with a cross court return as they moved to the interval.
After the break, Saina continued playing her own game, often reprimanding herself or accepting a missed chance during a rally. She changed the pace and came up with a wide variety of strokes to make Yihan run across the court.