Ryan Hall withdraws from 2013 Boston Marathon

Ryan Hall has pulled out of the 2013 Boston Marathon, citing a quad injury. Hall, the fastest American marathoner in history, having run a 2:06:17 at London, "missed crucial training due to a quadriceps strain," according to a press release from race sponsor John Hancock Financial.

Hall also holds the U.S. record in the Boston Marathon, running a blistering 2:04.58 in 2011.

Heart breaking to have to pull out of Boston. Want to thank all my sponsors and supporters for sticking by me through it all.

— Ryan Hall (@ryanhall3) March 13, 2013

The 30-year-old finished third in Boston in 2009, and fourth in 2010 and 2011.

Moses Mosop, the 2011 Boston Marathon runner-up and 2011 Chicago winner (2:05:37) has also been forced to withdraw because of injury.

Ryan Hall finished second place at the 2012 U.S. Olympic Marathon Trials, behind Meb Keflezighi, but failed to finish the marathon at the 2012 Summer Olympics -- Hall was forced to withdraw around mile 11 due to hamstring tightness. Keflezighi went on to finish fourth.

The 2013 Boston Marathon, the 117th running of the world famous road race, is set for Monday, April 15.