Saina, who slipped to world number 3 today, thrashed Ching 21-13 21-15 in a 36-minute contest to set up a clash with old foe Shixian Wang in the women's singles quarters.
Kashyap, meanwhile, upstaged Ho 21-11 21-14 in just 36 minutes and will face top seed Chen Long in the men's singles quarterfinal.
However, Kidambi Srikanth bowed out after going down 21-14 20-22 13-21 to Ginting Anthony of Indonesia in a battle that lasted 54 minutes.
Ching fought a tad harder in the second game but Saina dominated the proceedings just enough to pocket the match in just over half an hour.
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World no. 12, Kashyap came up with a clinical display against Wan Ho, winning a total of 42 points as compared to just 25 won by the Korean.
The opening game turned out to be a cake walk for Kashyap. Having opened up a 4-0 lead, the shuttler from Hyderabad simply dominated the proceedings.
In the second game, Wan Ho bounced back with a 2-0 lead to begin with but Kashyap soon caught up with him at 3-3 and the battle continued till 6-6 before the Indian reeled off six points on the trot to make it 12-6.
There was no looking back for Kashyap thereafter and he eventually sealed the game and the match pretty comfortably.