You don't win slams, nevermind 4 slams by the age of 21, on talent alone. That's not how tennis works, the sport is a big mental grind and it takes a lot of mental strength to win multiple slams and as many big matches as Alcaraz has won.
You're comparing his mental level to 3 talented headcases who won zero slams. It's a completely invalid comparison.
He's 3-0 in real matches vs. Sinner this year btw so I guess Sinner didn't have enough mental strength in those matches. His finals record career wise in big tournaments is absurdly good. If anything, his mental game is a strength. It's his propensity to play down to opponents that gets him in trouble at times but even with that, he's one of the most successful 21 and under players of all time. You don't achieve that on talent alone.
So Nalbaldian who beat the big three in the same tournament in sequence, or Kyrgios who in turn scalped the big three from a very young age, I must deduce from your reasoning that it is synonymous with mental strength on their part.
Monfils who at almost 40 years old still manages to maintain an acceptable level allowing himself to beat a player like Alcaraz who is almost 20 years younger, is this also synonymous with mental strength?
You have to do everything in proportion to the talent, otherwise it becomes useless to start such a discussion.
And in any case, explain to me how someone who allows himself to already win 4 slams at just 21 years of age, triumphing in this specific season at Roland Garros and Wimbledon, can at the same time allow himself to lose with that frequency against players clearly inferior to him.
The example of the matches with Sinner rather than validating your thesis strengthens mine, someone who beats 3 times in the season out of 3 Sinner matches and then loses to Jarry, Dimitrov, Draper, Monfils, VdZ, Machac, Humbert and Ruud, means that he exists a clear up and down problem that comes from mental solidity.
Sinner, on the other hand, is mentally very solid, and this is demonstrated by the fact that the rare matches he loses do so against players of his level or slightly below his, but against the players he has to beat he always wins.
Genius and recklessness really means being able to beat anyone but at the same time also being able to lose anyone, and I repeat that this is synonymous with a mental problem.
