Gilles Muller dumps out defending Queen's champion Grigor Dimitrov

Defending champion Grigor Dimitrov has been beaten in the second round of the Aegon Championships at Queen's Club by Luxembourg's Gilles Muller.

The world number 48 produced a powerful serving display to knock out the sixth seed on centre court and reach the quarter-finals.

In the first set, Muller had to save three break points in the third game of the match, and it looked like a tie-break would be needed with both men confident on serve.

However, Muller snatched it 6-4 as Dimitrov wobbled in the 10th game with a double-fault and loose forehand.

The second set did go to a tie-break and Dimitrov was the first to move ahead as he won three points in a row at the start of the breaker.

Muller hit straight back and the pair changed ends at 3-3 before the Luxembourger produced a forehand winner down the line to move ahead, serving it out 7-5 for victory.

He will next face the winner of this afternoon's match between top seed Andy Murray and Spain's Fernando Verdasco.