Barring a miracle in the next 48 hours, Chris Estwanik will not be defending his May 24th Derby title due to a torn muscle in the back of his right knee.The injury came while the five-time defending champion was doing an eight mile run on Saturday when he hyperextended the muscles in his knee, leaving him in a great deal of pain.After an MRI that confirmed the bad news and following doctor’s advice not to compete or risk further injury, Estwanik is ruling his participation as a five percent chance.He will see a specialist today that deals with this specific injury to see if it is possible to run through it.“Obviously it not good news, but injuries happen and it is what it is right now,” Estwanik said. “No one is ever happy with injuries but it is a part of sports and you have to live with these sorts of things.“It’s an overuse injury. The doctor said it is a result of running and consistently hitting the pavement in the same spot. Your muscles get overworked and when I hit the ground my knee buckled and hyperextended the muscle.“I asked if it would be something I could run through and he said he would be surprised if I could make it halfway before it completely ripped and that would be real problems, so you have to think long term here.“With that being said, there is a 95 percent chance I won't be running.“When you push yourself the way athletes do your body says that’s enough and that’s what the body has told me.“I’ve been very fortunate over the past five years to not have been injured. The timing of this is less than ideal so barring a miracle between now and then I won’t be out there.“There is a specialist on the Island that deals with these sorts of things, so unless he has something different to say and that I can run through the injury, it would appear it’s not possible to be out there.”Estwanik set the record of the fastest full marathon time by a Bermuda runner at the Boston Marathon just last month, clocking two hours 19 minutes and 55 seconds, a personal best that eclipsed his debut marathon result by more than four minutes.The 33-year-old’s time was also faster than the Bermuda residents’ record set in Detroit in 1972 by Peter Lever when he ran the 26.2-mile distance in 2.21.19.While still subdued by the news that will see his winning streak end at five in a row, Estawink he believes there are a number of athletes who have the ability to win this year’s edition of the race.He said he would be along the course, cheering on all the runners, including his wife, Ashley, who will be looking to successfully defend her women’s title.“There are number of runners that can win it. Tyler (Butterfield) will be running and is a solid runner, Jay (Donawa) is familiar with the course and could be in the running, along with Stephen Allen and Chayce Smith.“I will be out there cheering on the runners and my wife, I guess it will be a daddy day for me and the children.“I have been given a few offers to hop on boats and watch the runners along Harbour Road and then make my way the finish line, so I will see how the next few days go and take it from there.”