Sunday 21st January 1990.
'You cannot be serious' John McEnroe v Sweden's Mikael Pernfors.

McEnroe participated in that season's Hopman Cup which commenced on Boxing Day in 1989. McEnroe had ugly spats with linespersons and, at one point, thought of withdrawing from the tournament. He didn't but that proved to be the lull before the storm.

On this bright sunny Sunday, McEnroe looked calm and composed as he took the first set with ease. Then, in the second, Pernfors got the break when the lineswoman ruled a close call in favour of him. McEnroe ran towards her, stared at her for a minute while bouncing the ball on his racket.
Warning one: 'intimidation'.

He lost that set but took the third . Serving 2-3 on deuce, one forehand went astray. The racket was swiftly smashed to the ground.
Warning two: 'racket abuse'.

He was not ready to accept this. He summoned the tournament referee who ran onto the court to hear him out. Alas, he too couldn't help McEnroe.

As he was heading back, along with the supervisor, McEnroe yelled five words which are not good enough to be written here. They came running back, checked with the umpire about what they had just heard, and that was it for McEnore.
Warning three: 'verbal abuse'.

Game, set and match Pernfors.
The rules had changed from January 1st 1990 ( earlier it involved four steps instead of three) and McEnroe wasn't aware of it.

A low point in Tennis' history.
There's no one who can do that today. At least in the men's section of the draw.

Wait!
The man himself played earlier today in the legends doubles. He won this time and there was no drama.

'Yes, I am serious'....