Top seed Stanislas Wawrinka advanced to the final of the Chennai Open on Saturday after opponent Vasek Pospisil retired from their match with a back injury.

Wawrinka took the first set 6-4 and his passage to the final was confirmed when Pospisil quit with the second level at 5-5.

"It feels good to be in the final, but I feel sorry for my opponent," Wawrinka told reporters.

"He was playing well. I hope he is okay because this is the start of the season and it is important to be ready physically.

"It was a tough match before the final. I did not serve well but I was aggressive from the baseline and moved well on court. I will go into the final tomorrow with a lot of confidence."

Frenchman Edouard Roger-Vasselin will meet Wawrinka in the final after beating Spaniard Marcel Granollers 6-2 4-6 6-3.