Right now tennis tv is airing the Alcaraz Hurkacz Toronto final where it is apparent how bad Alcaraz’s mental strength used to be. To combat this, he has to be dominant with his skill. Alcaraz has shown on the biggest stages how well he can dominate the competition. He just doesn’t always do it, probably due to mental errors and nerves. But the level he can play at makes him a legend because it is more than capable of getting him 30 slams. But that’s not the only thing, the fact that Alcaraz had a close match with Hurkacz a while back is relevant enough to show on tv also makes Alcaraz a legend because it is proof he was good enough to take up space in the tennis history timeline, much like emerging Federer I would guess.