Yuki concedes quarter-final clash against Karunuday

After losing the first set 4-6, Yuki was leading the second 4-3 but a knee injury forced him to concede the clash at the R K Khanna Tennis stadium.

Yuki said it was a sane decision to opt out rather than aggravate the problem."Pain was always there. I have not fully recovered. After the power-packed first set, I felt the discomfort. I did not want to aggravate it," Yuki, who has been nursing tendinitis in both knees, said.

In the other quarterfinals, seventh-seeded Vijayant Malik tamed giantkiller Vignesh Peranamullur, 6-2, 7-5.

Vignesh had ousted second seed Rohan Gajjar in his previous clash.Malik plays sixth-seeded last week's winner Patrik Rosenholm, who edged past third-seeded Ranjit Virali-Murugesan 6-7(4) 6-7(2) in a tough match.