The 19-year-old entered at the start of the second half and fed Tomas Suslov in the 71st minute. Suslov dribbled to the top of the penalty area, cut toward the center of the field and beat goalkeeper Joao Virginia with a left-footed shot from the arc.
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Pepi's scoreless streak reached 30 games for club and country since he got two goals in a World Cup qualifier against Jamaica on Oct. 7.
He transferred in January from FC Dallas to Augsburg and was loaned to Groningen on Aug. 31 for the rest of the season after failing to score in his four Bundesliga matches this season.
Pepi has three goals in 11 international appearances and hopes to make the U.S. World Cup roster.