Andy Murray
Andy Murray had to overcome Muller's big serve to reach the last four Getty Images

Andy Murray survived losing the first set to reach the semi-finals at the Aegon Championships after a fine comeback to defeat Luxembourg's Gilles Muller at Queen's.

Muller, the big-serving world number 48, soared into a set lead but Murray won the second via a tiebreak before outlasting the left-hander 3-6 7-6 6-4 to set up a last-four meeting with Viktor Troicki or John Isner.

Despite producing another uncertain performance on his preferred surface, Murray remains on course to claim a fourth title at the pre-Wimbledon warm-up and yet knows his battles against big-serving players on grass has only just begun.

"Obviously you need a it of luck when you're playing someone like Gilles," said Murray. "I started to read his serves better in that tiebreak and that was when the match changed a little bit.

"It is always tough when you're behind and I wasn't getting many chances on his serve. I was holding my service games well but wasn't able to get the breakthrough. Towards the end, I started to relax more and I returned better and I played some really good tennis at the end.

"I love playing here. I've got a chance to win the event and all the guys in the semis do. I am in a good place right now, physically I feel good and with Wimbledon around the corner, it is always good to pick up some wins."