"I'm more concerned the World Cup final will have issues because the Wimbledon final is going on", said the eight-time champion after seeing off France's Adrian Mannarino in straight sets on Monday. "It was a good win but it was tougher than the scoreline to be honest".
'It was an important moment for me, I am happy to be where I am, ' he said. So it's really cool.
Khachanov's display was flashy but full of errors, and Djokovic was ruthless in punishing them, coming through 6-4 6-2 6-2 to set up a last-eight meeting with Kei Nishikori. As you have already guessed, it's Wimbledon time.
Also, the last of the women's top-10 seeds was knocked out at Wimbledon.
Julia Goerges advanced to her first Wimbledon semifinal with a 3-6, 7-5, 6-1 victory over 20th-seeded Kiki Bertens.
But the Argentine broke back immediately with a volley and then saved another break point at 5-5 with an ace.
Cibulkova was furious when Hsieh successfully persuaded the umpire to replay a point that was initially called in the Slovakian's favour and would have given her three set points in the opening set.
To claim Djokovic is back to his 12-time Grand Slam winning best would be a tad premature, but the 31-year-old Serb is certainly showing signs of getting closer to it.
Isner rode his big serve to advance over the Greek teenager 6-4, 7-6 (8), 7-6 (4).
"I told my team the other day that for me also, after all these years, it is surprising to be the number one seed, in the top-two rankings at 36", he said.
The only player with a superior head-to-head record over both grand slam giants, Djokovic has warned he's finally approaching his own brilliant best after an utterly unexpected two-year major title drought.
Del Potro is in his first quarter-final at the tournament since 2013 when he reached the semi-final.
Federer seemed pleased that his opponent raised his level in the second set after a first set he described as "almost too easy".
Kevin Anderson, the big South African who winds down from tennis by reaching for his guitar, admits he needs to be right on key from the start of his Wimbledon quarter-final against eight-time champion Roger Federer on Wednesday. In the process, he has extended his run of consecutive sets won at the All England Club to 32.
He has also lost all four meetings against the 20-time major victor, failing to win a set off the great Swiss star.
Federer boasts a 4-0 career record against 2017 US Open runner-up Anderson and 9-4 over Monfils.
Kerber was the runner-up at the All England Club in 2016, while 14th-seeded Kasatkina is in the last eight for the first time.
He is also the first Japanese man to reach the quarter-finals since Shuzo Matsuoka in 1995.