There will be a new May 24 champion with five-time winner Chris Estwanik set to pull out with a torn muscle in the back of his right knee.The injury stems from his preparations for his title defence which would have been his sixth in a row had he won during an eight-mile run last weekend."It was a freak injury, and really one that has come from overusage of the body," he said. "I went to the doctor and he confirmed the injury so there is a 95 percent chance I won't be running."Everyone loves records and this would have been one for the ages but with a record like this comes a bit of luck and good fortune, but I will be out there supporting the runners and my wife as they make their way through the course."Barring a miracle from a specialist that I will see tomorrow (Wednesday), I won't be running as you have to look to the future and this injury could end my career if I'm not careful and don't listen to doctor's advice."