The professional wrestling talent pool is in a constant state of flux.
With previous generations of performers stuck in inevitable decline, the onus is on promotions like WWE and NJPW to develop those who'll eventually take their seats at the top table, ensuring a seamless transition of power. Vince McMahon's promotion have continually struggled with this over the years, but primarily through their own doing. The talent is there: they just need to make better use of it.
2017 has seen countless performers take their game to the next level, placing them in a much stronger position than they were at the start of the year. For some, their improvement has been a simple case of tightening loose nuts and bolts, while others have undergone more dramatic transformations. Whatever the case, their growth is undeniable.
Note that we're looking at ability (inside the ring and out) here, not push. The Usos and Sami Zayn have been stronger this year than last, but they were always great, and their new spotlight has more to do with good booking than noticeable individual progression.
With that in mind, let's take a look at 2017's biggest improvers...