BRAZIL coach Mano Menezes praised the performance of new Chelsea signing Oscar after the midfielder played a starring role in their 3-2 win over Egypt at the Millennium Stadium.
Menezes' side had been tipped as one of the favourites to win gold prior to the tournament and they showed their class as goals from Rafael, Leandro Damiao and Neymar gave them a 3-0 half-time lead.
Egypt pulled two goals back through captain Mohamed Aboutrika and substitute Mohamed Salah but it was not enough to turn around the Group C encounter.
Oscar (right) created Brazil's first two goals and was a threatening attacking presence throughout, leaving Menezes delighted by his display.
He said: "It is clear that Oscar is a very influential player. He set up a lot of moves and chances for us and I don't want to publicise it too much as our opposition will know about him."
While Brazil started with a win, fellow favourites Spain, who included Euro 2012 winners Juan Mata and Jordi Alba in their side, were on the wrong end of a shock at Hampden Park as Yuki Otsu's goal gave Japan a 1-0 victory in Group D.
Spain's cause was not helped by the dismissal of Inigo Martinez five minutes before the break, and they could not find an equaliser.
Ryan Giggs has claimed Senegal's Sadio Manu could have been sent off three times for the number of woeful challenges he made as Great Britain and Senegal drew 1-1 in Manchester.
Giggs was left fuming at the robust Senegal approach, which makes Craig Bellamy and Joe Allen doubtful for Sunday's Wembley showdown with United Arab Emirates.
"There were a few naughty challenges in there and a few of our lads are probably struggling for Sunday now," said Giggs.