Adu entered the game in the 80th minute. Like his two cup goals, the strike came in the waning minutes and led Benfica to victory.
Last Wednesday, Adu came on in the 61st minute of Benfica's 1-0 win over Scottish champion Celtic in their Group D match on Wednesday. At 18 years, 4 months, Adu broke the record for the youngest American to play in the Champions League held by Jonathan Spector (18 years, 11 months) set when he came on as a sub for Manchester United against Turkey's Fenerbahce in 2004.
Adu joined Benfica last summer from Real Salt Lake, which he joined for the 2007 MLS season after three years with D.C. United.
His appearance against Maritimo was his second league game. He has played a total of 21 minutes in league play.
He made two appearances as a sub in the Portuguese Cup. And in addition to his Champions League appearance as a 61st minute sub, he played one game in the Champions League preliminary-round as a 37th-sub against FC Copenhagen.