For the second year in a row, Russia's Liliya Shobukhova is the first woman to cross the finish line.
LIVESTREAMING coverage runs from 7 a.m. until 11 a.m. Central Time. The livestream will include NBC 5 Chicago's on-air reporting and analysis, plus exclusive content not available on the broadcast.
UPDATE: Sammy Wanjiru and Liliya Shobukhova repeat as champions. Full story here.
Temps may rise into the 80s Sunday as throngs of marathoners take to the city's streets for the Bank of America Chicago Marathon. 45,000 registered, and 36,000 are expected to participate.
The forecast calls for lower 80s by the early afternoon, but lower humidity, which was a factor three years ago, when 35-year-old Chad Schieber of Michigan died on a blazing hot afternoon. See the full forecast here.
Defending champions Sammy Wanjiru of Kenya and Russia's Liliya Shobukhova return, and they'll be pushed by deep fields of elite runners. The winners earn $75,000.
Reigning Boston Marathon champion Robert Kiprono Cherulyot of Kenya will also compete, as will London Marathon winner Tsegay Kebede of Ethiopia.
Wanjiru and Kebede are currently tied for the lead of the World Marathon Majors series championship. A first-place finish by either could determine the winner. The season's last race is the New York Marathon in November.
On the women's side, three Ethiopians will push Shobukhova: Mamitu Daksa, the 2010 Dubai champion; Astede Baysa, a two-time winner of the Paris marathon; and Askale Tafa Magarsa, the 2008 Berlin runner-up.