#4 Tyler Bate
At the tender age of nineteen years of age, it's hard to quantify how good he is until you see him compete. He only began wrestling in 2012 and was first was seen in a notable independent promotion when he teamed alongside Trent Seven – who also trained him – in Chikara in 2015. He has continued to compete with them since then.
Bate has faced a number of notable names in wrestling, in particular, the current WWE Cruiserweight champion, Rich Swann, while being part of Preston City Wrestling. He was called 'The Iron Master" and faced Swann as part in his debut for the promotion in a four-way matchup. Bate has also faced two others that merit strong considerations to win the WWE UK championship, Pete Dunne and Mark Andrews.
Much like a number of others on this list, Bate has been very successful throughout his career. During his brief time, he has been a multiple-time tag team champion in the Chikara, Attack! Pro Wrestling and Kamikaze Pro wrestling promotions. While he has his whole career ahead of him, he could certainly make a name for himself before turning twenty years of age.