A highly anticipated female career was considered another battle between Hassan and Assepa: the gold and silver medalists in Paris last summer.
The couple was among the main group from the beginning, but in the mark of 20 km (12.5 miles), Hassan was five seconds ago with Assepa and Jepkosgei maintaining a relentless rhythm.
It seemed ready for a closed end, Butsefa, the former head of the absolute world record, kicked for the line and being a neck with Jepkosgei at 35 km (just under 22 miles), was 56 seconds ahead of 40 km and hero line.
“I won second here last year to win this year is very special. I’m really very happy,” Assefa told BBC One.
“Last year I had some problems with the cold and my ischiotibial adjusted towards the end. This year, the weather brings me better.
“I am really satisfied with how the races.”
The field for the male elite career was promoted as the best in London and the main group was still composed of nine athletes after 30 km (18.64 miles).
Sawe made its movement in the 31 km mark (19.26 miles) and, although the competition included Kiplimo, Mutiso, the four -time winner Eliud Kipchoge and the Olympic Tola Tamirat, none could match it.
The Kenyan stretched his leadership and Anyrance crossed the line a minute and 10 seconds ahead of his closest challengers.
“I am very happy. This is my fastest moment for the London Marathon,” he told BBC One.
“I was well prepared for this race and that is why it is an honor for me to have won.”