Men's top seed Rafael Nadal has brushed aside Pablo Carreno Busta 6-1, 6-2, 6-4 to move through to the fourth round at the Australian Open.
Australia's Kyrgios, seeded 23rd, overcame number 16 seed Khachanov in a five-set epic, 6-2 7-6 (7-5) 6-7 (6-8) 6-7 (7-9) 7-6 (10-8), at Melbourne Arena to secure passage to the fourth round.
After the drama of the previous night, when Roger Federer had won the last six points to deny another Australian, John Millman, in a final-set match tiebreak, Kyrgios looked like he was going to get the job done with the minimum of fuss when he led by two sets and 4-2 in the third.
"Man, it was insane", Kyrgios said. "I was thinking about the media if I lost, everything".
Tennis star Rafael Nadal accidentally hit a ballgirl with one of his shots during his second round match at the 2020 Australian Open Friday in Melbourne. He broke back for 4-3 and took the set to a tiebreak before saving a match point and going on to take it 8-6.
In a tight fourth set Kyrgios lost his cool when given a time warning on serve - the Canberran bitterly complaining about a bleeding hand he'd sustained falling over.
"Are you stupid? Can you not see?" he exploded at the official after throwing down his racket and holding out the injured finger, further describing the man in the chair as "an idiot" with an expletive thrown in for good measure.
Nadal will now face Nick Kyrgios for a place in the quarterfinals.
Nadal, who had earlier brushed aside the incident, said he preferred Kyrgios more when he was playing his fiery brand of tennis instead of drawing attention for his on-court antics.
Nadal's ferocious forehands and shot selection left Davis Cup team-mate Carreno Busta helpless and it continued in the second set, which was wrapped up two minutes quicker than the first.
Kyrgios admitted after the second round clash that he had aimed to hit Nadal "square in the chest" when the Spaniard was at the net.
In response to a time violation at the end of the second set, Kyrgios imitated the 19-time Grand Slam victor - a swipe of the hair on either side followed by a pick at the seat of his shorts.
He further endeared himself to his compatriots by sweeping into the third round at his home Grand Slam with victories on the Melbourne Arena court where he feels most at home.
Wawrinka won the Australian Open in 2014 for his first Grand Slam title. It was in September last year that Kyrgios was handed a 16-week suspension for taking subtle jibes at Nadal, labelling the Spaniard "Super Salty" last year and also mimicking his serves. "He's arguably the greatest player ever". "He's won some awesome titles already so it's the beginning for him".
"When he's doing the other stuff, of course I don't like".