In a meeting worthy of a Broadway show between two of the game's biggest servers and most combustible personalities, it was the Australian who was the better in the match's biggest moments, showing off a renewed focus and fitness.
Serbia's Novak Djokovic equals Pete Sampras's mark of seven titles at the All England Club and move within one of the men's record of eight held by Roger Federer.
Novak Djokovic and Nick Kyrgios have buried the hatchet and decided to go for dinner, with Sunday's final winner paying the bill.
Record-breaking Novak Djokovic hit top form after a sluggish start against Britain's Cameron Norrie, reaching an eighth Wimbledon final, where he will face Nick Kyrgios.
Nadal, a 22-time Grand Slam champion, will play Nick Kyrgios for a place in Sunday's final.
Stefanos Tsitsipas said Nick Kyrgios had an "evil side" after the Greek tennis player lost the third round match against the Australian at the All England Club.
World number-two ranked Daniil Medvedev of Russia beat John Isner of the United States 6-2, 6-2 in the National Bank Open semifinals to face American Reilly Opelka in the final.
Casper Ruud, a product of Nadal's tennis academy in Mallorca, has beaten top-20 players John Isner and Fabio Fognini to make his mark at the international teams tournament in Australia.
Eighth-seeded Khachanov rallied for a 6-7 (3/7), 7-6 (7/4) 6-2 victory over the volatile Australian, but the final set was close to farce, with Kyrgios engaged in a running dialogue with Irish chair umpire Fergus Murphy.
Rafael Nadal showed no signs of rust as he raced into a 5-0 lead against fellow Spaniard Roberto Bautista Agut in the first set on Court Rainier III, defending his Monte Carlo Masters title with 6-1, 6-1.
Five-time champion Roger Federer beat Australian Nick Kyrgios in three sets and reached the US Open last 16 while Slovakia's Dominika Cibulkova took out Wimbledon champion Angelique Kerber.
The carnage of seeds at the world's premier grass court tennis tournament continued, with only one of the top 10 women's seeds remaining in the tournament at the fourth round.
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