The world number eight saved three break points in the second set but struggled to land his first serve as Ramanathan secured one of his most cherished victories on the tour.
“I worked really hard for this,” said the 22-year-old Indian, who will meet Marcos Baghdatis of Cyprus in the quarter-finals. "I like the grass. Courts are fast. I took my chances and it worked out."
Wimbledon begins on Monday.
(Reporting by Hardik Vyas in Bengaluru; Editing by Toby Davis)
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