Mary Schwalm, The Associated PressGalen Rupp, far right, leads the men's elite runners as they break from the line at the start of the 2017 Boston Marathon in Hopkinton, Mass., Monday, April 17, 2017.
Steven Senne, The Associated PressYemane Tsegay, of Ethiopia, fourth from left, leads the pack of elite men runners along the course of the 121st Boston Marathon on Monday, April 17, 2017, in Hopkinton, Mass.
Elise Amendola, The Associated PressGeoffrey Kirui, of Kenya, crosses the finish line to win the 121st Boston Marathon on Monday, April 17, 2017, in Boston.
Charles Krupa, The Associated PressEdna Kiplagat, of Kenya, wins the women's division of the 121st Boston Marathon on Monday, April 17, 2017, in Boston.
Elise Amendola, The Associated PressManuela Schar, of Switzerland, wins the women's wheelchair division in the 121st Boston Marathon on Monday, April 17, 2017, in Boston.
Elise Amendola, The Associated PressBoston police on bicycles ride through the finish line area before the 121st Boston Marathon on Monday, April 17, 2017, in Boston.
Kayana Szymczak, Getty ImagesSpectators cheer the runners as they make their way past the 6 mile mark of the Boston Marathon on April 17, 2017 in Framingham, Massachusetts.
Elise Amendola, The Associated PressKathrine Switzer, who was the first official woman entrant in the Boston Marathon 50 years ago, crosses the finish line in the Boston Marathon, Monday, April 17, 2017, in Boston.
Elise Amendola, The Associated PressKathrine Switzer, center, the first official woman entrant in the Boston Marathon 50 years ago, wears the same bib number after finishing the marathon on Monday, April 17, 2017, in Boston. With Switzer are her husband Roger Robinson, left, and Joann Flaminio, right, of the Boston Athletic Association.
Mary Schwalm, The Associated PressLeeland Cole-Chu (15537) identifies Ben Beach, center, as he crosses the start line running his 50th consecutive Boston Marathon at the start of the race in Hopkinton, Mass., Monday, April 17, 2017.
Elise Amendola, The Associated PressMulti-time Boston Marathon winner Uta Pippig, left, congratulates Ben Beach, of Bethesda, Md., after he finished running his 50th consecutive Boston Marathon on Monday, April 17, 2017, in Boston.
Charles Krupa, The Associated PressEdna Kiplagat, left and Geoffrey Kirui, both of Kenya, hold a trophy together after their victories in the 121st Boston Marathon on Monday, April 17, 2017, in Boston.
Charles Krupa, The Associated PressJose Sanchez, of San Antonio, carries the United States flag across the finish line in the 121st Boston Marathon on Monday, April 17, 2017, in Boston.
Charles Krupa, The Associated PressMario Vargas, left, of Chile, and Terry Canning, right, of Britain, carry Julianne Bowe, of Hoboken, N.J., to the finish line in the the 121st Boston Marathon on Monday, April 17, 2017, in Boston.
Mary Schwalm, The Associated PressMeb Keflezighi, of San Diego, sits at the start line as he ties his shoes before the start of the 2017 Boston Marathon in Hopkinton, Mass., Monday, April 17, 2017.
Mary Schwalm, The Associated Press
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Galen Rupp, far right, leads the men's elite runners as they break from the line at the start of the 2017 Boston Marathon in Hopkinton, Mass., Monday, April 17, 2017.
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By Patrick Traylor | ptraylor@denverpost.com | The Denver Post
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The 121st , April 17, 2017, in Boston, Mass.