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John Isner predicts what Jannik Sinner’s ban from tennis could do to him years down the line

Image of John Isner speaking to the media after beating Taylor Fritz in 2020, inset of Jannik Sinner celebrating during his match against Mariano N...
Credit: Getty Images/Carmen Mandato/MARCO BERTORELLO/AFP
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Jannik Sinner recently returned to tennis, having missed three months of action.

The world number one began his year in scintillating form when Sinner won the Australian Open, beating Alexander Zverev in the final.

Sinner was then suspended from tennis for three months, which saw him miss four Masters 1000 events.

He was, however, cleared to return for his home tournament in Rome, where Sinner has made a fine start.

Internazionali BNL D'Italia 2025 - Day Six
Photo by Giuseppe Maffia/NurPhoto via Getty Images

Sinner beat Mariano Navone in his Italian Open second-round match before taking down Jesper De Jong in round three.

Ahead of his fourth-round clash with Francisco Cerundolo, one former tennis star has predicted what effect the Italian’s ban could have on him in the future.

John Isner thinks Jannik Sinner’s three-month suspension could ‘serve him well’ in the future

On the Nothing Major podcast, former Wimbledon semi-finalist John Isner shared his thoughts on Sinner’s ban.

“It is a perfect start for him. I actually think he was out for three months and he wasn’t hurt,” said Isner.

“I think this is a bit of a blessing in disguise because how often do you get three months?

“Of course, he would rather be playing these tournaments, but he had no choice. He could not play these tournaments.

“I think having three months to get stronger physically will serve him well many years down the road. Looking at this like another off-season he gained.”

Isner’s co-host Steve Johnson weighed in, highlighting the key difference he’s noticed in Sinner since his return in Rome.

“Twice as long an off-season he would usually get, and he looks physically, from my couch here in Los Angeles, he does look stronger, bigger,” said Johnson.

Jannik Sinner celebrates winning a point against Mariano Navone at the 2025 Italian Open
Photo by MARCO BERTORELLO/AFP via Getty Images

“Maybe it’s the all black outfit, but there is no arguing he is the best tennis player in the world right now and has been for the better part of 18 to 24 months.”

It’s certainly not outrageous to suggest Sinner is the best in the world right now, as the rankings prove the Italian is a class above.

RankNamePoints2025 titles
1Jannik Sinner9,7301 – Australian Open
2Alexander Zverev8,0851 – Munich Open
3Carlos Alcaraz7,8502 – Rotterdam Open, Monte-Carlo Masters
4Taylor Fritz4,8150
5Jack Draper4,4400
6Novak Djokovic4,1300
7Casper Ruud3,7151 – Madrid Open
8Alex de Minaur3,6350
9Lorenzo Musetti3,5500
10Holger Rune3,4401 – Barcelona Open
Official ATP top ten rankings

Sinner holds a 1,645-point lead over number-two ranked Zverev, a gap that is likely to widen, should the German fail to defend his Italian Open title this week.

A title for the 23-year-old in Rome would see him break through the 10,000 point barrier again, at 10,730.

He won’t want to get too far ahead of himself, however, and will first focus on his Italian Open fourth-round match with Cerundolo.

Jannik Sinner and Francisco Cerundolo’s head-to-head record

Sinner and Cerundolo have faced off four times on the ATP Tour, with the head-to-head level at two apiece.

Interestingly, Cerundolo beat Sinner in the fourth round of the 2023 Italian Open, their most recent encounter.

The Argentine narrowly lost the first set tiebreaker, before fighting back to win in three, advancing to just his third Masters 1000 quarterfinal.

Cerundolo’s win over Sinner was his fourth against a top ten opponent, a tally he has improved upon significantly since.

Mutua Madrid Open - Day Eight
Photo by Ion Alcoba Beitia/Getty Images
MatchOpponentOpponent’s rankFrancisco Cerundolo’s rankScore
2025 Madrid Open – 4RAlexander Zverev2nd21st7-5, 6-3
2025 Miami Open – 4RCasper Ruud6th24th6-4, 6-2
2025 Indian Wells – 4RAlex de Minaur10th26th7-5, 6-3
2025 Argentina Open – QFAlexander Zverev2nd28th3-6, 6-3, 6-2
2024 Paris Masters – 2RAndrey Rublev7th29th7-6, 7-6
2024 Laver Cup – RRCasper Ruud9th31st6-4, 6-4
2024 Croatia Open – SFAndrey Rublev9th37th7-6, 6-4
2024 Madrid Open – 4RAlexander Zverev5th22nd6-3, 6-4
2023 Paris Masters – 2RCasper Ruud8th21st7-5, 6-4
2023 French Open – 3RTaylor Fritz8th23rd3-6, 6-3, 6-4, 7-5
2023 Italian Open – 4RJannik Sinner8th31st6-7, 6-2, 6-2
2023 Barcelona Open – 3RCasper Ruud3rd32nd7-6, 6-3
2023 Miami Open – 3RFelix Auger-Aliassime6th31st6-2, 7-5
2022 Hamburg Open – 2RAndrey Rublev8th30th6-4, 6-2
2022 Swedish Open – 2RCasper Ruud5th39th6-4, 3-6, 7-5
Francisco Cerundolo’s top ten wins

The 26-year-old is, however, yet to secure a win against a world number one, a statistic he’d surely love to change when he takes on Sinner in Rome.

Cerundolo and Sinner will battle it out for a place in the quarterfinals of the Italian Open on Tuesday, May 13.