Meb Keflezighi - WITHDREW APRIL 5

Meb Keflezighi, a three-time Olympian that placed fifth in Boston in 2010 and third in 2006, is looking for a Boston win to add to his 2009 New York City Marathon medal. (Photo credit ADRIAN DENNIS/AFP/GettyImages)

Meb Keflezighi - WITHDREW APRIL 5

“As I come towards the end of my running career, there are still a few goals I want to achieve; winning the Boston Marathon is one of them,” said Keflezighi. (Photo by Patrick McDermott/Getty Images)

Abdi Abdirahman - WITHDREW APRIL 10

Abdi Abdirahman has appeared in four straight Olympic Games. (Photo by Thomas B. Shea/Getty Images)

Abdi Abdirahman - WITHDREW APRIL 10

At 36 years-old, 2013 will be his Boston Marathon debut. (Photo by Thomas B. Shea/Getty Images)

Kara Goucher

2013 will be Kara Goucher’s third Boston Marathon. She was disappointed to finish third in 2009 (pictured here). She returned and finished fifth in 2011 with a personal best 2:24:52. (Photo by Jim Rogash/Getty Images)

Kara Goucher

“The city of Boston captured my heart when I ran my first Boston Marathon in 2009,” said Goucher. “The support for the Marathon in Boston is incredible.” (Photo by Bob Levey/Getty Images)

Kara Goucher and Shalane Flanagan

For Shalane Flanagan, it will mark her Boston Marathon debut, a very special event for the Marblehead native. (Photo by Stu Forster/Getty Images)

Shalane Flnagan

“I watched the Boston Marathon religiously growing up and always dreamed about running from Hopkinton to Boston,” Flanagan said. (Photo by Thomas B. Shea/Getty Images)

Ryan Hall - WITHDREW MARCH 13

This will be the fourth Boston Marathon for Ryan Hall, a two-time Olympian who set an American course record in 2011 with a time of 2:04:58 — good for a fourth place finish. He finished third in 2009 and fourth in 2010. (Photo by Jim Rogash/Getty Images)

Ryan Hall - WITHDREW MARCH 13

“I go back this year eager to experience all that Boston has to offer: the epic crowds, the challenging course, but mainly to be a part of and make history,” Hall said. (Photo by Thomas B. Shea/Getty Images)