[VIDEO] American teenager Freddy Adu didn't need to wait long to make his European debut, but it was another offseason acquisition, veteran Portuguese midfielder Rui Costa, who rescued Benfica with both goals in its 2-1 victory over FC Copenhagen Tuesday in the first leg of their UEFA Champions League third-round qualifying series.

(Click here for Benfica-FC Copenhagen highlights.)

Adu had only arrived in Portugal last week for pre-season training, but he came on in the 38th minute for injured defender Luisao only minutes after Copenhagen had scored on a goal by Canadian Atiba Hutchinson

Adu, who received a loud cheer from the 55,000 fans in the Stadium of Light, had little impact on the game, playing much of the time on the wings.

Both Rui Costa goals were "golaços," the first a low drive inside the far post in the 25th minute and the second a low drive inside the near post with five minutes remaining.

GAME SUMMARY:
Aug. 14 in Lisbon
Benfica (Port.) 2 FC Copenhagen (Den.) 1. Goals: Rui Costa 25, 85; Hutchinson 35.
Benfica -- Quim, Luis Filipe, Luisao (Adu, 38), David Luiz, Leo, Petit, Katsouranis, Nuno Assis (Nuno Gomes, 74), Rui Costa, Bergessio (Fabio Coentrao, 46), Cardozo.
FC Copenhagen -- Christiansen, Kvist, Gravgaard, Hangeland, Jensen, Noregaard (Sionko, 88), Wurtz, Silberbauer, Hutchinson, Gronkjaer, Allback (Nordstrand, 78).
Referee: Viktor Kassai (Austria).
Att.: 55,000.