Evans Chebet of Kenya breaks the tape at the finish line to win the Boston Marathon on Monday for the second straight year.

Hellen Obiri of Kenya wins the women's division of the Boston Marathon on Monday.

The elite men break from the starting line during the 127th Boston Marathon on Monday morning in Hopkinton, Mass.

Red Sox great David Ortiz, the Grand Marshal of the Boston Marathon, holds the trophy at the finish line on Monday morning.

Marcel Hug of Switzerland breaks the tape to win the men's wheelchair division of the Boston Marathon.

Eliud Kipchoge of Kenya warms up before the start of the 127th Boston Marathon. Kipchoge, the greatest marathoner in history, raced for the first time in the Boston Marathon on Monday.

Susannah Scaroni breaks the tape to win the women's wheelchair division of the 127th Boston Marathon on Monday.