The attacker struck during a game at al-Shuhadaa stadium in the Babil province city of al-Iskandariya, roughly 30 miles (50 kilometers) south of Baghdad.
ISIS claimed responsibility, according to a statement posted online by supporters.
The Sunni Islamist extremist group has boasted about terrorist attacks around the world, most recently this week’s carnage in Brussels that killed 31 people and wounded more than 300.
The bulk of ISIS’ brutal actions — not to mention the vast majority of its active members — are in the Middle East. It spawned in the mid-2000s from al Qaeda in Iraq, and it has captured large swaths of territory in both Iraq and neighboring Syria in recent years.