Ramanathan beat Jeevan 6-3 6-3 and will now take on Vijay Sundar Prasanth in the last four clash.
A fit-again Saketh Myneni, who was out of action because of a foot injury, also showed fine recovery to defeat doubles specialist Vishnu Vardhan 6-3 6-3.
Myneni will face second seed Sriram Balaji, who blanked Sasikumar Mukund of Tamil Nadu 6-0 6-0.
Prasanth faced a stiff resistance from Siddharth Rawat before pulling off 6-3 1-6 6-1 victory en route to the the last-four in the Rs 1.05 lakh prize money event.
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