Temperamental Nick Kyrgios crashed out of Wimbledon after appearing to throw an entire game in protest at receiving yet another warning.
The 20-year-old Australian was hit with a code violation for swearing during his last-16 match against France's Richard Gasquet.
He spent the next game refusing to play the ball, which led BBC presenter Sue Barker to say: "I have never seen anything like it at Wimbledon."
Later he had a spat with the umpire over whether he was taking too long to change his socks.
The constant outbursts did not help the youngster's cause and he went on to lose the match in four sets.
Fans of both players exchanged chants as things heated up on Court 2.
After Frenchman Gasquet won the first set, spectators with English accents chanted "You're not singing any more" and "It's all gone quiet over there" at a group of Australians.
They also made reference to the Ashes cricket series between England and Australia, which starts this week.
Kyrgios has been in hot water with officials several times during this year's tournament.
He was given a warning after bouncing his racquet into the crowd in the previous round after denying that he had called an umpire "dirty scum" on day one.
In his exchange with British umpire James Keothavong - the brother of former player Anne Keothavong - Kyrgios said he was staying on the court to change his socks.
The Canberra player told the official: "If you're going to get angry with me for that, that's another level.
"Mate, Rafa (Rafael Nadal) and stuff play 30 seconds in between points every time and all I'm doing is putting my sock back on."
He later called out to Gasquet: "Richard, I'm changing my socks", before adding "Yeah, he's fine... unbelievable," when the Frenchman raised no objections.
Meanwhile, Serena Williams sent her elder sister Venus packing in two sets in their fourth-round tie.
The sisters - who have won Wimbledon five times each - were facing each other on Centre Court for the sixth time.
It was the first time they had played each other in a grand slam in six years.
Serena, 33, is on course for a grand slam of titles and is just two behind Steffi Graff's record of 22 major wins.
Venus, who has just turned 35, is currently battling auto-immune disorder Sjogren's syndrome.
The disease attacks glands that secrete fluid such as tear and saliva.
Golfers Lee Westwood, Ian Poulter, Sam Torrance, Paul McGinley and Miguel Angel Jimenez are expected to watch the action from the Royal Box today.
Comedian Michael McIntyre, writer Max Hastings and former Olympic triple jump champion Jonathan Edwards will also be in the box on Centre Court alongside All England Club president the Duke of Kent and Princess Michael of Kent.
The All England Club confirmed that it would observe the minute's silence to commemorate the 10th anniversary of the London 7/7 bombings tomorrow at 11.30am.
A spokesman said: "Play on all courts, except Centre Court and No 1 Court, will start at 11.45am instead of 11am."
Centre Court and Court 1 usually start play at 1pm.
It will follow an emotional minute's silence at midday on Friday in memory of the victims of the Tunisia beach massacre.
All of Me singer John Legend was among the spectators on Centre Court watching the Williams sisters go toe to toe.
The 36-year-old American posed for a courtside Instagram picture with his model girlfriend Chrissy Teigen from the players' box.
Teigen, 29, showed off her legs in a knitted number in cream, red and black with heels.
Canadian rapper Drake was also back among Serena's entourage after he was spotted at SW19 last week.
Kyrgios faces a hefty fine if he is judged to have thrown a game.
The International Tennis Federation's (ITF) code of conduct says: "A player shall use his best efforts to win a match when competing in a grand slam tournament. Violation of this section shall subject a player to a fine of up to 20,000 US dollars (£12,860) for each violation."
ITF rules allow a maximum penalty of 250,000 US dollars (£160,000) for "aggravated behaviour" in circumstances which are "flagrant and particularly injurious to the success of a tournament, or are singularly egregious".
Gasquet also had an outburst after the third set which saw him smash his racquet when he let two match points slip.
Kyrgios's mother Nill tweeted after his match: "You fought hard little fella. Just remember, adversity is the building blocks for success, learn from them and grow."