The blasts exploded among spectators crowded into the stadium at around 11pm on Friday evening as they watched the local "Ramadan Cup".
Taliban fighters battled police and troops in the western city of Farah overnight, officials said, as security forces struggled to regain control of a city that has been under growing pressure from the militants for months.
There were two explosions near the city's directorate of finance, the Nangarhar provincial governor's spokesman Attaullah Khogyani said, adding that "a number of attackers" had entered the building.
Pakistan's top judge has ordered the first official investigation into the country's deadliest terror attack, a massacre at a school that killed more than 150 people in 2014, authorities said Thursday.
Gunmen set off at least three explosions in the Afghan capital, Kabul, on Wednesday and then battled the security forces from buildings they occupied in the latest in a spate of violence to rock the city.
Afghan forces backed by air strikes have retaken a district in the northern province of Badakhshan that was seized last week by Taliban insurgents, officials said, as fighting continued across Afghanistan.
Afghan security forces arrested seven suspected militants who were planning to attack a government-run hospital and an interior ministry office in the capital Kabul on Thursday, officials said.
The Taliban said the offensive was partly a response to US President Donald Trump's new strategy for Afghanistan announced last August, which gave US forces more leeway to go after insurgents.
Gunmen have attacked a voter registration centre in Afghanistan, kidnapping five people, including three election employees, and destroying documents, officials said Wednesday.
Though security has improved in Pakistan's remote areas bordering Afghanistan, sectarian militant attacks still occur.
Taliban militants launched a pre-dawn raid on a district government compound in Afghanistan on Thursday, killing at least seven people including the local governor, officials said.