Left quad tight and not working starting around 5 miles. Progressively worse throughout the race. Had to do some walking in the last 6 miles. Very painful. Should have quit at 10 miles or half marathon. Was on a good pace to start, but this was a very long and difficult struggle. Found out after that I had a stress fracture in my upper right leg with muscle detaching from bone and had to take 6 weeks off. This was my worst ever marathon by all measures. 30 mile per hour headwinds made it difficult to breathe as well. I was crying and putting cold water onto my left leg and having to stop for minutes at a time in an attempt to stretch it out.