Simbu clocked two hours, nine minutes and 32 seconds to clinch the gold medal. Kenya's Joshua Kirkorir took the second spot with a time of 2:09:50 in a tough competition.
Kirkorir's compatriot Eliud Barbgetuny came third as he completed the distance in 2:10:39.
Till 30 kms, the race was neck to neck between the three top finishers. However, in the last stages, Simbu surged ahead and eventually won the race.
The full marathon was flagged off from the iconic Chhatrapati Shivaji Terminus in South Mumbai at 7.20 AM by a host of dignitaries.
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Again in the women's section, the top three runners were fighting hard and at 21 km mark, all of them recorded a timing of 1:14:03. Kitur eventually moved ahead of the other two to become victorious at the end.
Simbu, who had competed in the 2015 World Championships in Beijing, said he trained in the hills in Tanzania for the marathon, which made him "perfect" for the race.
Simbu, who was participating in a full marathon after Rio Olympics, said that all his past experiences helped him win today.
Among the Indians, Olympian Kheta Ram, who was eyeing to better his personal best of 2:15:26 he clocked at Rio last year, came first in 2:19:51.
Bahadur Singh came second with a time of 2:19:57 while Th Sanjith Luwang of Manipur was third in 2:21:19. Elam Singh, also of Army, was the fourth in 2:21:27 while Rahul Kumar Pal was fifth with a time of 2:21:43 was.
Jigmet Dolma from Leh-Ladakh, who was running the Mumbai Marathon for the first time, clocked 3:14:38 to finish third.
Kheta Ram said "his timing was not so good", while Bahadur Singh opined that good practice helped him.
"I tried it (but could not come first). In 2014, I stood 3rd in the Mumbai Marathon with a time of 2:22:43," Bahadur, who clocked his personal best, said.
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