Title favourite and world number eight Wawrinka needed just 54 minutes to brush aside the challenge of 79th ranked German rival in the rain-hit second round match.
     
The young Indian wild card pair of Ramkumar Ramanathan and N Sriram Balaji stunned an experienced American team of Scott Lipsky, who is world number 31, and Rajeev Ram in straight sets.
     
The Tamil Nadu players shocked their rivals 7-5 6-3 to reach the quarter-finals. Rajeev Ram is a title winner here in 2009 with Eric Butorac.
     
Balaji stood out with his backhand winners while Ramkumar, who is on a high after dumping India's number one player Somdev Devvarman in singles, served exteremely well.
     
Balaji and Ramkumar had a good 2013 season in doubles and both of them had ended the year with title wins with their respective partners.
     
Now they will start favorites against Croatian team of Marin Draganja and Mate Pavic, who got a walk over.
     
Earlier, Youzhny conceded his match against Israeli Dudi Sela when he was trailing 1-3 in the opening set due to a stomach problem.
     
A winner here in 2008, Youzhny issued a statement late on saying it was not possible for him to continue.
     
"It's a stomach problem. I actually wanted to play, but it was not possible. When you have restricted movement, it’s no use to play and lose. It started last week in Thailand, some virus, and it continued here this week too. I'm sorry for the tournament and the spectators, but it’s not possible for me to play," he said.

 (Agencies)

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