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The United States opened their World Cup campaign with a 4-1 win over Paraguay on Friday, powered by a first-half double from striker Folarin Balogun, but the victory was tempered by concern over the fitness of Christian Pulisic.

The emphatic Group D win marked a dream start for the co-hosts, whose four goals were their most ever in a World Cup match. Balogun became the first US player to score twice in a World Cup game since the 1930 tournament.

“Amazing result,” US captain Tim Ream said.

“It’s exactly the way we wanted to start the tournament.”