Adola stopped the clock at 59.06 minutes to break the record set by countryman Atsedu Tsegay last year.
He edged past 2014 IAAF/AL Bank World Half Marathon champion Geoffrey Kamworor, who finished the event with a timing of 59.07 minutes. Mosinet Geremew of Ethiopia was third after clocking 59:11 minutes.
In the International Elite Women category, defending champion Florence Kiplagat of Kenya won with a timing of 01:10:04 beating compatriot Gladys Cherono (01:10:05).
Ethiopian runner Worknesh Degefa finished third with a timing of 01:10:07.
Coming into the Delhi marathon, Adola had settled for bronze in 2014 IAAF/AL Bank World Half Marathon, competition that was won by Kamworor.
“The competition was very stiff due to the early morning cold of Delhi. I am very happy to have overcome it,” Adola said.
Men’s Elite was moderate to start with but athletes got into their elements in the later part.
“The race was very nice. First 10 km was slow but the last portion was quite fast. I will try to win next year,” Kamworor said.
In the women’s category, reigning World Half Marathon champion Gladys Cherono was stunned by two-time world champion Kiplagat.
“The race was nice. Everyone was strong. I had some tactics. But I could have bettered my timing,” an elated Kiplagat said adding that she is confident of make it three in a row next year.