#5 Sara Del Rey

Sara Del Rey is one of the finest wrestlers of her generation, having wrestled in numerous promotions before reaching the WWE in 2012.
Del Rey was the face of women's wrestling in Chikara, Shimmer and ROH when women's wrestling started to get serious traction at a time the WWE was still in the 'bra and panties' phase of their product.
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In ROH, she became part of the famous 'Kings of Wrestling' stable alongside Chris Hero and Cesaro. She became the fourth female in history to make the PWI list of top 500 wrestlers in the world.
After her independent run, she joined WWE in 2012. Despite being only 32, she was assigned the role of a trainer in NXT and never wrestled a televised match for the WWE. Many female wrestlers including Charlotte and Sasha Banks have given glowing recommendations of the work she does at NXT and Del Rey is currently the NXT assistant head coach.
Despite this, it seems weird that WWE never chose to put her on TV on their main roster. Whether it was a decision made by the company or by herself, it was a blow for wrestling fans who wanted to see Del Rey in action in the WWE.