I am getting better with each match. They have changed the balls here. They are harder now, which is good, but it took me some time to adjust to it,' Vardhan said.

Vardhan next plays compatriot Rupesh Roy, who advanced to the last eight stage, after Ronak Manuja retired with a back problem, trailing 6-7(3), 0-2.

In the other second round singles matches, N. Vijay Sundar Prashanth, who shocked fourth seed Rohan Gajjar Tuesday, continued his good run, taking out experienced Ashutosh Singh 6-3, 6-4. Prashanth now plays fifth seed Peter Lucassen of Netherlands who was given a tough fight by Indian Jeevan Nedunchezhiyan before retiring due to cramps, trailing 6-7(6), 4-6, 1-4.

Sixth-seeded Ranjeeth Virali-Murugesan of India dispatched Sudanwa Sitaram 6-1, 6-3 to set up a quarter-final clash with Young-Jun Kim of South Korea who overcame American Shane Le Porte 6-7(5),7-5, 6-2.

Eighth-seeded Sean Thornley of Britain beat compatriot Tim Bradshaw 6-3, 7-6(6). He will meet another countryman third-seeded Chris Eaton who beat Seong-Yoon Chung of South Korea 6-2, 7-5.