ANDY MURRAY'S Wimbledon swansong looks in serious doubt after he was forced to retire from his second-round match at the cinch Championships with a back injury.

The two-time SW19 champion will undergo a scan to determine the extent of the problem which left his right leg numb just before he walked on to Centre Court at Queen’s Club to face Australian Jordan Thompson.

Murray was clearly in pain during the warm-up, and his right leg and hip seemed to buckle underneath him as he served for the first time in the match.