Karan Rastogi's [ Images ] campaign in the US $15,000 ITF event in Kuwait came to a screeching halt on Friday when he conceded his semi-final due to a back problem.

Fifth seed Rastogi was up against sixth seeded Australian Miles Armstorng but did not take the court because of a back problem.

He had withdrawn from the two US $50,000 Challenger tournaments, in New Delhi [ Images ] last month, due to the injury.

He returns to the country on Sunday and is next scheduled to play an ITF Futures tournament in Iran from June 16.