Chicago Marathon

The elite men's group takes off from Monroe Street and Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

The elite men's group takes off from Monroe Street and Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Thousands of runners take off from Monroe Street and head up Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Thousands of runners take off from Monroe Street and head up Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Ben Maenza of the United States makes his way up Columbus Drive during the hand cycle start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. Maenza later won first place among the group of hand cyclists. (Erin Hooley/Chicago Tribune) 

Ben Maenza of the United States makes his way up Columbus Drive during the hand cycle start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. Maenza later won first place among the group of hand cyclists. (Erin Hooley/Chicago Tribune) 

Thousands gather at Monroe Street and Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Thousands gather at Monroe Street and Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Elite runner Sammy Kitwara of Kenya crosses the finish line second at the Bank of America Chicago Marathon on Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Elite runner Sammy Kitwara of Kenya crosses the finish line second at the Bank of America Chicago Marathon on Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Thousands of runners take off from Monroe Street and head up Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Thousands of runners take off from Monroe Street and head up Columbus Drive for the start of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Men's elite winner Dickson Chumba of Kenya checks his watch after crossing the finish line at the Bank of America Chicago Marathon on Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Men's elite winner Dickson Chumba of Kenya checks his watch after crossing the finish line at the Bank of America Chicago Marathon on Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

A woman stands with a Mexican flag at the finish line of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

A woman stands with a Mexican flag at the finish line of the Bank of America Chicago Marathon Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune) 

Women's elite winner Florence Kiplagat of Kenya gives a thumbs up after crossing the finish line at the Bank of America Chicago Marathon on Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune)

Women's elite winner Florence Kiplagat of Kenya gives a thumbs up after crossing the finish line at the Bank of America Chicago Marathon on Sunday, Oct. 11, 2015 in Chicago. (Erin Hooley/Chicago Tribune)

Scenes from the start and the finish line of the 2015 Chicago Marathon.

More photos from the Chicago Tribune.