Yaya Sanogo scores 4 and Joel Campbell scores 1 as Arsenal beat Benfica 5-1.
The Gunners lead the Emirates Cup table with eight points going into day two.
The French striker had failed to register for the club despite an encouraging first season in English football, but caught fire at a jubilant Emirates Stadium.
It was the first time that an Arsenal player has scored four in one game since Andrey Arshavin at Anfield in April 2009, and it was some statement from the 21-year-old.
