The latest incident occurred on an outer court at the Foro Italico, with Nick Kyrgios losing 6-3, 6-7 (5), 2-1 against Casper Ruud.
The 23-year-old Kyrgios, ranked 72nd in the world, beat second-ranked Rafael Nadal in the second round, then knocked off Stan Wawrinka and John Isner to reach the final.
The 23-year-old Kyrgios, ranked 72nd in the world, beat second-ranked Rafael Nadal in the second round, then knocked off Stan Wawrinka and John Isner to reach the final.
Kyrgios set up a quarterfinal match against Stan Wawrinka, a 7-6 (5), 6-4 winner over seventh-seeded Steve Johnson in the hardcourt event at The Princess Mundo Imperial.
Kyrgios has won four titles on the ATP Tour and is widely considered to be a talented and temperamental player, but has a history of sanctions for his behavior on and off the court.
Federer, in his first tournament since March, was trailing Nadal by 100 points at the start of the week and is guaranteed of taking the top spot on Monday regardless of how Sunday's final goes.
The fiery Australian reportedly pulled out of the doubles event believing he has a serious chance of winning his maiden Grand Slam title in the singles at Melbourne Park.
It was a fourth title for the enigmatic 22-year-old Australian, and his first since 2016.
With a hard earned win against compatriot Matthew Ebden, the fiery Australian has set up a quarterfinal clash against former Brisbane International runner-up Alexandr Dolgopolov, who beat Horacio Zeballos 6-1, 6-2 in the second round.
The 13th-seeded Australian packed his bag and left the court after losing the first set 7-6 (5) to Steve Johnson on Tuesday.
Kyrgios could find himself in hot water again if he does not have a legitimate explanation for his decision to retire after losing the first set of his opening-round match in a tie-break against Steve Johnson in Shanghai Masters.
World No.1 Nadal, who was tied with Roger Federer and Alexander Zverev at five titles this season, picked up his 75th career singles trophy with the win in Beijing.
Kyrgios said he found his rhythm after losing the first set and smashing his racket, choosing at one point to sing along with the stadium soundtrack.
Nadal is 57-9 this season and leads the tour with five ATP singles titles, including the French Open and US Open.
The tournament is organized to honour the legendary Rod Laver, an 11-time major champion who won two calendar-year Grand Slams.
The 32-year-old Tsonga needed just one hour and 23 minutes to get the better of Cameron Norrie.
Melbourne, Australia: Andy Murray ensured there would be no five-set comeback for local hope Nick Kyrgios on Tuesday night, beating the 19-year-old Australian 6-3 7-6 (5), 6-3 in a quarterfinal match at the Australian Open.Kyrgios
Melbourne, Australia: He upset Rafael Nadal at Wimbledon, and followed up Sunday by beating the guy who ousted Roger Federer at the Australian Open. Next up for Nick Kyrgios is a quarterfinal against Andy Murray
Melbourne, Australia: Nick Kyrgios is no longer just the kid who upset Rafael Nadal at Wimbledon, he's also the teenager who beat the guy who beat Roger Federer at the Australian Open.Nick Kyrgios came back
NEW YORK : Spinning in 70 mph second serves, grabbing at his hamstring during points, Andy Murray gritted his way through head-to-toe cramps to win at the U.S. Open. Murray outlasted Robin Haase 6-3, 7-6
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