Antonio Perez / Chicago TribuneRunners receive a cool water spray as they participate in the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
Jose M. Osorio / Chicago TribuneRunners make their way down Columbus Drive in Chicago at the start of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.- Antonio Perez / Chicago TribuneOver 41,000 runners participate in the 2016 Bank of America Chicago Marathon on Oct. 9, 2016, in Chicago.
- Antonio Perez / Chicago TribunePeople cheer on runners on the Franklin Street Bridge as the runners participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneFirst place men's finisher Abel Kirui, right, hugs third place finisher Gideon Kipketer after crossing the finish line of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneWheelchair racers move through the Loop in the 2016 Bank of America Chicago Marathon on Oct. 9, 2016.
- Antonio Perez / Chicago TribuneOver 41,000 runners participate in the 2016 Bank of America Chicago Marathon on Oct. 9, 2016, in Chicago.
- Antonio Perez / Chicago TribuneRunners make their way down 18th Street as they participate in the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneWomen's wheelchair participant Tatyana McFadden (251) leads the women participants at the start of the race down down Columbus Drive in Chicago of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneA drummer makes noise as runners participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneWheelchair participants start and make their way down Columbus Drive in Chicago at the start of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneRunners start the 2016 Bank of America Chicago Marathon on Oct. 9, 2016.
- Antonio Perez / Chicago TribuneWinner Florence Kiplagat, left, and other women runners participate in the Bank of America Chicago Marathon on Oct. 9, 2016 in Chicago.
- Jose M. Osorio / Chicago TribuneFlorence Kiplagat (KEN) wins the women's division of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneKenyan Abel Kirui kneels and prays after he wins the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneOver 41,000 runners participate in the 2016 Bank of America Chicago Marathon on Oct. 9, 2016, in Chicago.
- Antonio Perez / Chicago TribuneOver 41,000 runners participate in the 2016 Bank of America Chicago Marathon on Oct. 9, 2016, in Chicago.
- Jose M. Osorio / Chicago TribuneMarcel Hug, right, edges out defending champion Kurt Fearnley, left, in the men's wheelchair division of the 2016 Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneRunners receive a cool water spray as they participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio/ Chicago TribuneEarly morning racers prepare for the start of the 2016 Bank of America Chicago Marathon on Oct. 9, 2016.
- Jose Osorio / Chicago TribuneTatyanna McFadden wins the women's wheelchair division of the 2016 Bank of America Chicago Marathon on Oct. 9, 2016.
- Antonio Perez / Chicago TribuneRunners make their way down 18th Street as they participate in the Bank of America Chicago Marathon on Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneDiego Estrada is the first USA runner in the men's division to cross the finish line in eighth place of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneRunners at the start of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneRunners participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneAbel Kirui beat fellow Kenyan and defending champion Dickson Chumba to win the Bank of America Chicago Marathon on Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneJakob Anderson (bib 4266) is emotional after receiving his medal for finishing the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneMarathon workers pick up discarded clothing in the Loop after the 2016 Bank of America Chicago Marathon on Oct. 9, 2016, in Chicago.
- Jose M. Osorio / Chicago TribuneElite runners at the start of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneFans holding cat masks attend the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneFlorence Kiplagat (KEN) runs to Gideon Kipketer (KEN), hands out, after she wins the women's division of the Bank of America Chicago Marathon on Oct. 9, 2016.
- Antonio Perez / Chicago TribuneRunners participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneRunners participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneAbel Kirui wins the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneRunners make their way down 18th Street as they participate in the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneKoran flags are held up high as runners participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneSerena Burla (USA), the first American woman to finish, at the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneJack Farrell and sister Maebe look for their mom who was a runner as they cheer other runners participating in the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Jose M. Osorio / Chicago TribuneRunners walk on Columbus Drive in Chicago near a fence where runners remove their layers of clothes at the start of the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
- Antonio Perez / Chicago TribuneRunners participate in the Bank of America Chicago Marathon down the streets of Chicago, Sunday, Oct. 9, 2016.
- Jose M. Osorio/ Chicago TribuneRunners start the 2016 Bank of America Chicago Marathon on Oct. 9, 2016.
- Antonio Perez/ Chicago TribuneDemocratic U.S. Senate candidate Tammy Duckworth wheels down LaSalle Street in the 2016 Bank of America Chicago Marathon on Oct. 9, 2016.
Antonio Perez / Chicago Tribune
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Runners receive a cool water spray as they participate in the Bank of America Chicago Marathon on Sunday, Oct. 9, 2016.
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