The 112th running of the Boston Marathon was held yesterday. The men's race was a tour de force by now four-time champ Robert K. Cheruiyot (Kenya), who attacked a small lead group midway through the race and held on for a big win. The women's race, on the other hand, came down to a literal sprint between two unheralded but tough-as-nails runners, Dire Tune (Kenya) and Alevtina Biktimirova (Russia). Watch it and see the closest finish in the history of the women's race.