TAMPA, Fla. (AP) – Josh Wolff, who scored the only goal for the United States in a victory over Costa Rica, scored on a 20-yard free kick as the Chicago Fire beat the Tampa Bay Mutiny 1-0 Saturday.

Wolff left with a left foot injury after being tackled from behind by Tampa Bay's Craig Demmin. He had the injury treated with an ice pack and watched the rest of the game from the bench.

"It's not the ankle ... it's the arch of the foot," Wolff said. "Until they look at it, I don't know what it is."

Wolff was scheduled to have X-rays Saturday night.

Tampa Bay's Mamadou Diallo, last year's MLS goal-scoring leader, did not play because of a two-game red card suspension. He will also miss next Saturday's game at Chicago.

Mutiny defender Kevin Anderson left early in the first half with a right hamstring injury. Defender John Maessner received a red card in the 68th minute for taking down DaMarcus Beasley from behind.

Chicago is 2-1. Tampa Bay is 2-2.