That was followed by a more comfortable and unexpected victory against the fifth seed, Jo-Wilfried Tsonga. I don't know in Wimbledon his results, but for sure they were very good, also.
Fourth seed Cilic, victor in 2012, overpowered American teenager Stefan Kozlov 6-0 6-4 while Querrey, who triumphed seven years ago at the west London club, got the better of Australian Jordan Thompson, winning 7-6 (3) 3-6 6-3.
"It is another match without losing serve, so that's extremely pleasing". At 2-1 Dimitrov showed all his battling qualities to save six break points but in his next service game he succumbed. The world number 26 consolidated the break with a scintillating serve out wide, followed by a crushing victor down the line. Cilic, the higher ranked player, should reach the final but it would not be a huge surprise if it goes the distance or if indeed Muller triumphed.
Neither player earned a break point as the high-quality serving continued in the third set, leading to a decisive tiebreaker. Cilic is bidding to become the first man since Pete Sampras in 1995 to win the singles and doubles titles at one Queen's.
In the third set, Dimitrov managed to fend off eight break points but still was broken twice as Lopez cruised to the finish line. The Luxembourger then made good on his second set point to force a decider. You need time, need matches.
Muller will face Marin Cilic, the highest remaining seed at No. 4, on Saturday.
Cilic failed to convert his opportunities in the second set, however, and one lapse of concentration at 5-6 blotted his copybook to allow Muller to snatch the second set.
Cilic, a victor at Queen's in 2012, had coasted through the opening set against Muller, who was broken for the first time in this year's tournament in game six.
The left-hander saved it with a crushing forehand victor down the line with some good defensive skills. Due to his lack of confidence helped Muller to win the second set.
Both players got off to a good start in the tiebreak and the 29-year-old American got the first mini-break of the match at 2-1 but Muller produced a devastating forehand victor down the line to remove the mini-break advantage.
Querrey needed more than two hours to advance with 15 aces and two breaks of the young Australian.
But the 23-year-old's bid to reach only his second Tour-level quarter-final was brought to an end by Querrey's 7-6 (3), 3-6, 6-3 win at the Wimbledon warm-up event.