The injury was to his quad, according to a message on his website, KevinNash.com, posted shortly after Raw tonight. The report also said surgery is already being scheduled.
He screamed in agony in the ring, but was calmer backstage as trainers and medics assessed his condition.
Nash wasn't scheduled to wrestle until house shows this coming weekend, but a late change in plans led to him having to get his ring gear sent to him at the last second. Booker Brian Gewirtz pushed for Nash to return tonight. There's no indication at this point whether Nash coming back earlier than he had planned had anything to do with being more susceptible to such an injury.
Nash has wrestled just four matches for WWE since his returning, and in two of those matches has suffered major injuries, including his one singles match.
Credit to: PWTorch.com