While Cilic will be the outright favourite in the next match, Ramkumar had a confidence-boosting win over world number eight Dominic Thiem at Antalya Open last season.
The Indian tennis legend also stressed on the fact that we need good singles players if India want to do well in Davis Cup World Group as the top players take part and have to look beyond only doubles events.
Yuki, country's top singles player, overcame Ramanathan 4-6 6-3 6-4 in a little over two hours at Balewadi Sports Complex.
With the outcome already decided, Yuki Bhambri won the dead fifth rubber against Canada's Brayden Schnur 6-4 4-6 6-4 as India lost the World Group Play-off tie 2-3 to the hosts.
This was Ramanathan's second consecutive defeat against the American, having lost to him in the second round of the Roland Garros Qualifier in 2015.
After going down in the first set, Ramkumar Ramanathan rebounded strongly to register a 6-7 (5-7), 6-1, 6-4 win over Christopher Eubanks .
The 22-year-old from Chennai is now India's best-ranked player in the singles.
Ramkumar Ramanathan will next face veteran Cyprus star Marcos Baghdatis in the quarter-final.
India today took an unassailable 3—1 lead over New Zealand after Ramukumar Ramanathan routed Finn Tearney.
Melbourne: Yuki Bhambri was the only Indian to cross the first hurdle in the Australian Open qualifiers Wednesday while Somdev Devvarman and Ramkumar Ramanathan fell by the way side after featuring in tight matches.Yuki, ranked
Pune: India's top singles players, led by Somdev Devvarman, easily advanced to the second round of ATP Pune Challenger but rising star Ramkumar Ramanathan made a shock first-round exit, here on Tuesday.Third seed Somdev proved
Chennai, Jan 3: The fourth seed Israeli pair of Jonathan Erlich and Andy Ram breezed past the inexperienced Indian doubles pairing of Mohit Mayur Jayaprakash and Ramkumar Ramanathan in the first round of the doubles
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