Meb WD's from the Boston Marathon

A persistent calf injury has forced three-time Olympian Meb Keflezighi to withdraw from race. AP Photo/Seth Wenig

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Olympic silver medalist Meb Keflezighi has been forced to withdraw from the 117th Boston Marathon on April 15 because of a persistent calf injury, race organizers said Friday. The same injury had also knocked the 38-year-old, three-time Olympian from Mammoth Lakes, Calif., out of the NYC Half on March 17.

"Despite my best efforts, a nagging injury to my calf has not healed sufficiently, so I have to withdraw from the Boston Marathon,” Keflezighi said through a statement provided by John Hancock Financial, the organization which funds and manages Boston's elite field. "I'm very disappointed. My training was going well in January and February, which had me very excited about the possibilities this spring. I even skipped the NYC Half Marathon to focus on getting healthy for Boston, but unfortunately, it wasn't enough. I ran out of time to recover enough to compete for a victory at the Boston Marathon.”

Organizers also said that Kenyan Laban Korir has withdrawn from the race on advice of his coach, Patrick Sang.