Hassan said she paid the price for her fast start over the last part of the race but she held on to win her fourth marathon in six starts, including her triumph at last year's Paris Olympics.
Record-busting shoes loom large in marathon debate
Kenyan Brigid Kosgei broke Paula Radcliffe's 16-year-old women's marathon world record but former Alberto Salazar coached athletes, including Mo Farah, were never a factor in the Chicago Marathon.
Assefa set a blistering early pace, gradually shaking off any competition to pulverise Kenyan Brigid Kosgei's record of two hours 14 minutes and four seconds set in 2019.
Ethiopia's Yalemzerf Yehualaw stormed to victory in the women's London Marathon on Sunday ahead of last year's winner Joyciline Jepkosgei.
Ethiopian Shura Kitata won a thrilling London Marathon as a stunned world record holder Eliud Kipchoge faded late in the race
Yeshaneh crossed the finish line in one hour, four minutes and 31 seconds at the World Athletics Gold Label road race, eclipsing the previous record of 1:04:51
Britain's Mo Farah won a record sixth successive Great North Run after setting his personal best time on Sunday. The Olympic gold medallist raced ahead of Ethiopian Tamirat Tola in the final mile to cross the line in 59 minutes and six seconds.
Kenya's Eliud Kipchoge shattered his own marathon world record on Sunday, winning the Berlin race with a time of 2:01.09 to shave half a minute off his previous world best set in the German capital four years ago.
After biding his time for much of the race, the British four-time Olympic track champion surged to the lead in the final four miles and broke Ethiopian Mosinet Geremew to shatter the European marathon record of 2:05:48 despite wet and sometimes windy conditions.
Kenya's Peres Jepchirchir won the Olympics women's marathon in Sapporo on Saturday, out-duelling compatriot Brigid Kosgei in the final minutes and claiming her country's second consecutive gold medal in the event. Kosgei took silver and Molly Seidel of the United States, competing in just her third marathon after moving up from shorter distances, claimed bronze.
Summary of sports events and persons who made news on Sunday
A summary of Saturday's Track and Field action at the Tokyo Olympics.
The sport's governing body (WA) said that with immediate effect and for elite competition only, road shoes must have soles no thicker than 40mm and not contain more than one rigid, embedded plate.
A summary of sports events and sports persons, who made news on Sunday