Novak Djokovic was given a massive test by Italian sensation Lorenzo Musetti but, according to Boris Becker, the teenager should not have retired when he did.
The 19-year-old Musetti produced a sensational opening two sets to roar into a commanding lead over the world number one in incredible fashion. But at some point, Musetti sustained an injury in the three-hour and 27-minute encounter as Djokovic wore down his young opponent in masterful fashion to recover in a formidable comeback.
The top seed won an unbelievable 10 games in succession and 13 of 14 as Musetti wilted through an apparent mixture of a developing injury and pure exhaustion. Djokovic held a dominant lead in the fifth and deciding set before the Italian decided he could not battle on any longer and retired when behind 6-7(7) 6-7(2) 6-1 6-0 4-0.
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According to Eurosport expert Becker, Musetti should have done everything possible to complete the match and not retired when he did with Djokovic two games from victory.

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"Novak is a champion and he's been in a situation like this before," Becker told Eurosport. "He then reduces his emotions and the other guy starts thinking, 'Oh, I can beat the number one in the world here', and in those five minutes he's already lost the third set.
"You always have to keep at it and believe in yourself from start to finish, especially against the big guys. Lorenzo Mussetti is the best teenager, together with [Jannik] Sinner.
"Novak had problems with Musetti's style of play. He does everything quite well. He doesn't have the big weapon, but the serve is okay, the movement, the technique and also the confidence because he had already won many matches this year.
"When you face the biggest on the scene, you have to be ready physically and mentally. The young guns don't understand that. It's not just playing tennis, it's about character and personality.
I haven't seen a very bad injury. That's why I don't think it's good to stop. You should have respect for the other player and say, 'He beat me today'. Then it's 6-0. It's a test of maturity. But athletically, he can absolutely keep up.
"For me [in the quarter-finals], it’s advantage Berrettini. He has an off day now and had long matches before. Now he has watched the match very closely and he saw Djokovic is beatable."
Earlier in the match, there was a very nasty moment during the first set when the teenager took a tumble on an advertising board.

'Seriously nasty!' - Awful trip from Musetti on advertising board against Djokovic

At the end of what was an engrossing and entertaining rally, Djokovic pushed his opponent right to the back of the court with a smash with Musetti left very uncomfortable.
As the 19-year-old stepped back, he ended up landing on a metal advertising board at the back of the court where a line judge would sometimes be stationed. Musetti landed with a thud and, thankfully, the board collapsed under his weight. Even more thankfully, the Italian did not sustain a nasty injury.
Prior to that and in the same game, Djokovic was left baffled by an overrule from the umpire that then got overruled itself.

'Half the mark is on the line!' - Djokovic rows with umpire on overrule

A huge serve down the T from the world number one was initially called out by the line judge at the back of the court, which the umpire immediately overruled.
But upon closer inspection, the umpire then overruled himself while standing at the net as Djokovic walked over to debate the decision. The number one seed, clearly unhappy with the call - and subsequent double-overrule - made his feelings known to the umpire.
In the quarter-finals, Djokovic will next take on another Italian, ninth seed Matteo Berrettini, after he was handed a walkover due to Roger Federer withdrawing from the tournament.
Djokovic could take on the 13-time champion at Roland Garros, Rafael Nadal, in the semi-finals in Paris in what would be a repeat from last year's final in the postponed autumnal edition. The three most successful players in the history of the men's game have won 17 of the last 20 Grand Slam titles between them.

Highlights: Djokovic comes through big Musetti scare to reach quarters

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Watch all the action from the 2021 French Open live on Eurosport, eurosport.co.uk and the Eurosport app with 13-time champion Rafael Nadal eyeing a remarkable 14th title and 2020 Roland Garros sensation Iga Swiatek aiming to replicate her stunning triumph.
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