Novak Djokovic cost himself a shot at the 2020 U.S. Open when an on-court tantrum led to him striking an official with a ball.
It does not appear many lessons have been learned.
Djokovic once again found his competitiveness boiling over in the third set of Tuesday's quarterfinals match against Alexander Zverev at the Australian Open, destroying his racket in a fit of rage after losing a point.
This outburst led to Djokovic actually damaging the court, forcing a ball person to sweep up the pieces of the broken racket.
Djokovic managed to compose himself and take the third and fourth sets on his way to a 6-7 (6), 6-2, 6-4, 7-6 (6) victory.
Still, this wasn't a particularly good look for someone who was apologizing for a similar outburst just a few months ago.