"I think it's not fair, but it is the way it is in the midst of the emotions of a match".
Djokovic had four break points in the first two service games alone and suffered a Wimbledon meltdown as he bounced his racket off the ground, argued with the umpire, and then went on to lose the second set.
The No. 12 seed grew into the match and showed more shades of his old stamina that led him to Grand Slam triumphs, and he'll next face either Rafael Nadal or Juan Martin del Potro, who meet later on Wednesday.
Djokovic's momentum continued into the second set and he raced into a 3-0 lead.
After two years of physical and mental struggles, Djokovic appears fit and confident and ready to try to add to his tally of 12 grand slam titles.More news: Roger Federer vs Kevin Anderson, Wimbledon 2018
"I think it was great quality tennis and in the final set there were some incredible points", said Nadal who was a 7-5 6-7 4-6 6-4 6-4 victor. He's not been in the latter stages of a major event so much recently, I think Queen's was his first final in a year and he looked like he had a few doubts in that match against Cilic but in terms of his level and the way he's playing, I think he's back where he wants to be.
Scheduled last on No. 1 Court, Djokovic and Khachanov did not get underway until after 19:00 local time at the All England Club on Monday.
Del Potro was the only one of the quarter-finalists in action on Tuesday as he finished off a tough four-set victory over Gilles Simon.
Despite leading by two sets and having a match point, Federer was beaten by South African big-server Anderson in the biggest shock of the tournament so far. I know how I threw the racquet.
'I don't think it really mattered, to be honest.More news: Eating solid foods earlier promotes better sleep in babies
'I don't think it would have changed if I played there past year, ' the 20-time Grand Slam champion said. Not just an experience, but a challenge that I've set for myself.
"I am peaking at the right moment".
The final last-eight clash is unlikely to feature too many rallies, with John Isner taking on Milos Raonic. But a semi-final?
There was success for Britain, meanwhile, in the doubles, with Joe Salisbury, partnering former champion Freddie Nielsen, and Dominic Inglot, with Franko Skugor, through to the men's doubles semi-finals, but Jamie Murray and Bruno Soares are out.More news: Nevada to execute inmate with fentanyl in U.S
- Leahy: Trump's Supreme Court Pick 'More Than Frightening'
- Croatian firefighters go viral after missing historic win for emergency
- Former UCLA basketball star found dead after recording heartbreaking video
- Adam Jones Attacked in Atlanta Airport
- Roger Federer not concerned about start of World Cup game
- Rafael Nadal, Kevin Anderson march into Wimbledon quarter-finals
- India’s Iran oil imports fall as USA sanctions fears bite
- Redskins Pick Cornerback Adonis Alexander In 2018 Supplemental Draft
- Trump blasts Germany at North Atlantic Treaty Organisation summit over gas pipeline deal with Russian Federation
- Photographer gets caught up in Croatia's celebration... and then receives a kiss