Japan forward Yuki Otsu scored in the first half in a 1-0 win over 10-man Spain on Thursday in men's Olympic soccer, hurting the Spaniards' chances of winning a gold medal.

Otsu broke away from his marker during a corner kick and tapped a shot past goalkeeper David de Gea.

Spain center back Inigo Martinez was sent off while trying to stop Japan forward Kensuke Nagai during a goal-scoring opportunity. After that, Japan controlled the tempo and could have scored at least five more.