Two Kenyan runners, both of them making their Boston Marathon debut, have won the prestigious race.Edna Kiplagat, a Kenyan policewoman and two-time world champion marathoner, finished first in the women's race with a time of 2:21:52. Rose Chelimo, a Kenyan-born Bahraini runner, placed second.Geoffrey Kirui, also of Kenya, won the mens' race at 2:09:37 — his first-ever marathon victory. He edged out Portland runner Galen Rupp by 21 seconds.It was a big day for debut runners at Boston, according to Runner's World.In the women's race, 25-year-old Jordan Hasay ran her first-ever marathon in 2:23:00 to place third. It was the fastest-ever debut by an American woman, Runner's World says.And in the men's race, 26-year-old Suguru Osako of Japan — also competing in his first marathon — placed third with 2:10:28.Meanwhile, competitors in the wheelchair race finished in world-best times, The Associated Press reports: