Australian Open favorite Daniil Medvedev called a staff member an 'idiot' with 'no brain' as he battled to a pulsating late-night victory

• Daniil Medvedev's Australian Open irritation continued during his come-from-behind quarterfinal win.
• After conceding two sets, the Russian lost his temper when the image on a big screen changed mid-point.

Daniil Medvedev lost his cool yet again at the Australian Open Wednesday, this time branding a screen operator, an "idiot" with "no brain" as he battled his way into the tournament's last four.

The world number two came from two sets behind to beat Canadian youngster Felix Auger-Aliassime in a thrilling affair at the Rod Lavar Arena, eventually winning 6-7 (4-7), 3-6, 7-6 (7-2), 7-5, 6-4.

Trailing in the fourth set, Medvedev became angry when the big screens at either end of the court kept changing to an image of Auger-Aliassime mid-point, which the Russian complained put him off.

Speaking to chair umpire Damien Dumusois, he said: "Can you ask the operator to stop being really stupid and put the huge plans of Felix's face just before my return?

"How stupid can he be? Idiot."

Medvedev then muttered to himself: "You really need to be no brain to do it. It's unbelievable."

The umpire acknowledged the request and could be seen putting a call in to the match organizers to address the issue.

Auger-Aliassime had a match point shortly after, however was unable to capitalize, with Medvedev thumping an ace to keep the contest alive before going on to take the set and level the match.

After surviving three break points in the second game of the fifth set, the Russian then broke for a 2-1 lead. He then held serve for the rest of the match to secure victory and book his place in the semifinals, where he faces Greece's Stefanos Tsitsipas on Friday.

Medvedev has not been a happy bunny this tournament

After knocking out home favorite Nick Kyrgios in the second round, Medvedev clashed with the crowd because he thought they were jeering him throughout the match.

Fans in the stands could regularly be heard shouting Cristiano Ronaldo's famous goal celebration "SIUUU" during the clash, which the Russian mistook for boos.

"[Remaining calm and focused] is the only choice when you get booed between first and second serve," he told four-time Grand Slam winner and US tennis legend Jim Courier during his on-court interview after the match. "You have to stay calm and win the match."

The comment prompted actual boos from the crowd, to which Medvedev did not take kindly.

"I'm sorry I can't hear you," he told Courier as he tried to speak again. "Guys, I can't hear him, please. Show some respect for Jim Courier, he won here guys, thank you."

Then, during his fourth round victory over Maxime Cressy, Medvedev ranted at the umpire, his opponent, and another official.

The world number two called Cressy "lucky" and "boring" as he struggled to break the 24-year-old's resistance in the final set, while he also he accused the umpire of allowing the American too much time on his serve.

Following the win, Medvedev admitted that he "got a little bit crazy" and that he was "not happy" with the way he behaved.