The Serbian earned his 800th match win yesterday by overcoming France's Adrian Mannarino 7-5, 6-1 to reach the semi-finals of a tournament for just the second time in 2018.
However, the spring in his step on the London grass-courts was evident as he dispatched Adrian Mannarino 7-5, 6-1 to set up a semi-final against another in-form Frenchman, Jeremy Chardy, who yesterday defeated Frances Tiafoe of the U.S. 6-4, 6-4.
Cilic, runner-up to Roger Federer at Wimbledon last year and this year's Australian Open, was relentless, however, and seized on a couple of Kyrgios groundstroke errors in the opening tiebreak to pocket the first set.
In what has been a hard season following injury, Djokovic is bidding for his first title this week and has looked closer to his best than at many times in the past year. I'm definitely not one of the favourites in Wimbledon, so I'll just try to keep it humble.
"I will play as long as I feel like playing. It was a tough match, with no breaks for me until the final set".
His zest for the game certainly seems to have been revitalized and he has been showcasing some seriously impressive form on the immaculate grass courts of Queen's club by strolling to victory in his first two matches, most notably with an emphatic straight-sets destruction of World Number 5 Grigor Dimitrov.
Djokovic's last final - and title - also came on a British grass court when he defeated Gael Monfils in Eastbourne last July.More news: Hornets agree to trade Howard to Nets for Mozgov
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"Tennis is still the sport that I love with all my heart".
Despite spending much of the set in damage-limitation mode, Djokovic snatched the set. Obviously I have been hoping to get here and working hard for it.
"I have to keep my expectations very low, considering my results in the last 12 months".
The three-time Wimbledon champion wasted an early opportunity to break before Cilic saved a match point at 4-5 and then won six points from 4-1 down in the tiebreaker to level the match.
Videos picked up by fans show Kyrgios playing the circle game with his camp, clearly more interested in having a laugh than trying to break down Cilic's serve.
But Djokovic found his rhythm and converted his 6th break point to level at 4-4. "One in the right hand and one in the left hand!"