A thrilling finish in the women's race had spectators on edge.
After a 7th-place showing, Ritzenhein looks ahead with renewed confidence.
Re-live the thrilling elite races with our photo gallery.
Linden fourth in women's race, Ritzenhein seventh in men's race.
The live broadcast is available on television and online.
Which one is your favorite?
Nothing like last-minute advice from an all-time great.
They've made their name in ultras, but they're leaving the trails behind for one day in Boston.
Some of the top amateurs in the Boston Marathon field got together at Tracksmith headquarters.