The 18-year-old U.S. international angled his shot home in injury time to equalize after appearing as a substitute in the 71st minute. Matheus earlier gave the visitors a 12th-minute lead.
Adu also scored a late equalizer in the previous round against Amadora in September. Benfica went on to win that game on penalties.
One of the highest-profile players in U.S. soccer, Adu has seen little action since joining the Lisbon club from Real Salt Lake in July for a $2 million transfer fee....
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