Emily Sisson’s Boston debut

Emily Sisson has been one of the best American distance runners of her generation for years. The odd part is that she has never run Boston. That changes on Monday, April 20, when the American marathon record holder is scheduled to make her debut in the 130th Boston Marathon. The weekend around her is already taking shape. The Boston 5K is set for Saturday, April 18, and the marathon follows two days later on Patriots’ Day, the center of the city’s running calendar (baa.org, baa.org). What makes the debut feel late is Sisson’s résumé. She is not arriving as a promising newcomer. She is arriving as the fastest American woman ever over the marathon distance, thanks to the 2:18:29 she ran in Chicago, a mark that still stands as the national record and that the B.A.A. itself uses to identify her in the 2026 field announcement (baa.org, news.providence.edu). She also comes with deep New England ties. She graduated from Providence College and built much of her career in Rhode Island and Massachusetts, which makes Boston less a random major marathon than the obvious race she somehow had not yet run (baa.org, news.providence.edu). That history matters because Boston is not where runners usually go to chase a personal best. Chicago rewards rhythm. Boston punishes it. The course rolls downhill early, then asks for restraint, then sends runners into the Newton hills and over Heartbreak Hill before the final turn onto Boylston Street. Sisson’s record was built on a fast, flat layout. Her Boston debut is interesting for the opposite reason. It is a test of judgment, patience, and how much strength she has late in a race that rarely unfolds cleanly (baa.org, baa.org). She is stepping into a women’s field that gives her no room to ease in. Defending champion Sharon Lokedi returns after running 2:17:22 in Boston last year, a course record that chopped more than two and a half minutes off the previous mark. The broader American group is unusually deep too. The B.A.A. says 13 U.S. women in the field have run under 2:26, and the entire 2024 U.S. Olympic marathon team — Sisson, Fiona O’Keeffe, and Dakotah Popehn — is entered (baa.org, baa.org). That is part of why Sisson’s first Boston feels bigger than one athlete checking off a famous race. Boston is loading this year’s women’s race with both international stars and the strongest American contingent it has had in a long time. The weekend starts with the Boston 5K, which the B.A.A. says will bring about 10,000 runners through Back Bay on April 18, now under a new presenting sponsorship from Mass General Brigham Cancer Institute. Then, two mornings later, the sport shifts to Hopkinton, where 30,000 marathoners will head toward Boston and one of them will finally be Emily Sisson (baa.org, baa.org, baa.org).