Grigor Dimitrov has become the latest seed to suffer a shock exit at Queen's after a straight-sets defeat to Gilles Muller on Thursday.
The reigning champion, who is yet to reach a final since winning his fourth title at Queen's Club last year, was beaten 6-4, 7-6(5) on Centre Court.
"I'm just going to stay positive," said Dimitrov, who suffered a first-round exit at the French Open. "Wimbledon is coming up. I'm going to have good time to get ready. Yeah, Everything is going to be fine for me."
He added: "I'm just going to probably rest a little bit. It's good to let the body recover. First week on grass it's always a bit intense on the body. You're a little stiff every day.
"I'm just going to get a little bit of a rest and get out on the practice court and keep working. This is pretty much the best thing I can do right now.
"There's not much else to think about. I've just go to go out there and perform. I felt I have been quite unlucky in the past weeks with a lot that has been going on, and it's something that I accept and I need to fight through."
Dimitrov had been on course to meet Andy Murray - whom he beat in the quarter-finals of Wimbledon last summer - on Friday, with the Scot going on to beat Fernando Verdasco.
However, a double fault from the Bulgarian at 5-4 down gave Luxembourg's Muller set point in the opener, which he duly took.
World No.48 Muller, who has never been past the second round here, then came back from 3-0 down in a second-set tie-breaker to take the second of his two match points, securing his place in the last eight.
Dimitrov's exit follows those of Rafael Nadal and Stan Wawrinka respectively in the first and second rounds.
Feliciano Lopez, the man Dimitrov beat in last year's final at Queen's, was also dumped out following a gruelling three-set match against big-serving John Isner.
All three sets went to a tie-breaker with American Isner holding his nerve to beat the eighth seed 7-6 (5), 6-7 (9), 7-6 (4).
Isner will face Viktor Troiki in the last eight after the Serb came from a set down to defeat fourth seed Marin Cilic 6-7 (8), 6-2, 6-3.