Chicago Running the final 15 miles by herself, Catherine Ndereba of Kenya easily won the Chicago Marathon on Sunday and broke the world mark set just a week ago.
Her time of 2 hours, 18 minutes, 47 seconds shattered the women's world best by nearly a minute.
"I was thinking in my mind this morning that if the climate was good I'd go probably on a pace of 2:20," Ndereba said. "It was overwhelming."
Ndereba eclipsed the world mark of 2:19:46 set in Berlin by Japan's Naoko Takahashi last week.
In the men's race, Ben Kimondiu held off fellow Kenyan Paul Tergat in the final mile.
Ndereba, the defending women's champion, broke away in the 11th mile, expanding her lead to 10 seconds over Lornah Kiplagat. Four miles later, she was ahead by nearly a minute. From there, she ran alone.
Ehtiopia's Elfenesh Alemu was second in 2:24:54 and Australia's Kerryn McCann third in 2:26:04. Kiplagat, last year's runner-up, dropped out with a stomach problem.
Rod DeHaven of Madison, Wis., was the first American finisher, taking sixth in 2:11.40.
A 22-year-old Seattle man collapsed near the finish line and died. Luke Roach was pronounced dead at Northwestern Memorial Hospital. Preliminary information showed Roach's body temperature reached 107 degrees.
Roach is the third person to die in the marathon's 24-year history and second in the last two years.