Wimbledon Men's Singles top 16 seeds are set: 1. Djokovic 2. Nadal 3. Ruud 4. Tsitsipas 5. Alcaraz 6. Auger-Aliassime 7. Hurkacz 8. Berrettini 9. Norrie 10. Sinner 11. Fritz 12. Schwartzman 13. Shapovalov 14. Cilic 15. Opelka 16. Carreño Busta
As a Nadal fan, in my opinion, the biggest threats are FAA, Cilic, and Hurkacz
The three that I have mentioned above have the big serve and consistent backhand to trouble Nadal on a grass court especially if Nadal is off on his return game.
I think Matteo is dangerous I just think his backhand slice will get eaten alive by Nadal (and Djokovic). As for Alcaraz, he is talented enough to reach the QF, but he is too inexperienced on Grass to lose early (like 3rd Round).