Margin	Year	Winner
10 seconds	2006	Rita Jeptoo (2:23:38) over Jelena Prokopcuka (2:23:48)
16 seconds	2004	Catherine Ndereba (2:24:27) over Elfenesh Alemu (2:24:43)
16 seconds	2000	Catherine Ndereba (2:26:11) over Irina Bogacheva (2:26:27)
29 seconds	2002	Margaret Okayo (2:20:43) over Catherine Ndereba (2:21:12)
30 seconds	1973	Jacqueline Hanson (3:05:59) over Nina Kuscsik (3:06:29)
40 seconds	1980	Jacqueline Gareau (2:34:28) over Patti Lyons (Catalano) (2:35:08)
44 seconds	1978	Gayle Barron (2:44:52) over Penny L. DeMoss (2:45:36)
46 seconds	1997	Fatuma Roba (2:26:23) over Elana Meyer (2:26:51)
1:05	1981	Allison Roe (2:26:46) over Patti Catalano (2:27:51)
1:25	1996	Uta Pippig (2:27:12) over Tegla Loroupe (2:28:37)
1:31	2003	Svetlana Zakharova (2:25:20) over Lyubov Denisova (2:26:51)
1:40	1995	Uta Pippig (2:25:11) over Elana Meyer (2:26:51)
1:48	1994	Uta Pippig (2:21:45) over Valentina Yegorova (2:23:33)
2:22	1991	Wanda Panfil (2:24:18) over Kim Jones (2:26:40)
2:26	1999	Fatuma Roba (2:23:25) over Franziska Rochat-Moser (2:25:51)
2:39	1990	Rosa Mota (2:25:24) over Uta Pippig (2:28:03)
2:39	1977	Michiko Gorman (2:48:33) over Marilyn T. Bevans (2:51:12)

Source: Boston Athletic Association