Ramkumar, 22, had qualified for the ATP250 event and progressed to quarterfinals, where he lost to veteran Marcos Baghdatis.
The Chennai lad earned 57 points for his effort and as a result leapfrogged 38 places in the ladder to be the highest- ranked Indian in the singles now.
He is followed by Yuki Bhambri (222), Prajnesh Gunneswaran (259), N Sriram Balaji (291) and Sumit Nagal (342), who jumped 27 places.
In the WTA rankings, Sania Mirza remained at number seven in the doubles and Ankita Raina was highest-ranked singles player at number 274. Karman Kaur Thandi was next best at 413.
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