#4 WWE commentator Corey Graves
Unfortunately, Corey Graves had to retire at the age of 30 because injuries from his independent wrestling days caught up with him. During his days in the indies, Graves wrestled all over the world and won various championships, which put him on WWE's radar.
The company gave Graves an opportunity to wrestle on NXT. He competed as a singles wrestler and battled various Superstars like Seth Rollins and Alex Riley before heteamed with Neville to win the WWE NXT tag team titles.
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The duo dropped the titles a few months later to The Ascension and shortly afterward he suffered a concussion, rendering him inactive.
He returned a few months later but unfortunately, he suffered another concussion that put him out of action indefinitely. As a result, Graves followed the doctor's order and retired.
On Dec. 11 2014, he announced his official retirement from in-ring competition and immediately became a part of the NXT's commentary team. Since then, he has worked his way up as a part of both Raw and SmackDown's commentary team.