Matthew Polinsky (born February 24, 1984) is an American sports commentator, university professor, and retired professional wrestler. He is signed to WWE, where he performs as a commentator under the ring name Corey Graves; also providing English commentary in its sister promotion, Lucha Libre AAA Worldwide. As a former in-ring competitor, he is a one-time NXT Tag Team Champion. In 2014, Polinsky announced his official in-ring retirement due to his concussion issues and revealed that he would be joining NXT's commentary team with immediate effect. In 2021, he won the WWE 24/7 Championship despite still being retired. Polinsky is also known for his work on the independent circuit under the ring name Sterling James Keenan.