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Javier Mascherano and Lucas Leiva have both enjoyed opening match victories in the Olympics - but Ryan Babel's Holland have had to settle for a disappointing draw in their first game.
Mascherano played all 90 minutes of Argentina's 2-1 victory over Ivory Coast in Group A of the competition.
The Liverpool midfielder picked up a yellow card in the second half of the match as goals from Lionel Messi and Lautaro Acosta secured a hard-earned win.
Earlier in the day Lucas helped Brazil to a 1-0 victory over nine-man Belgium.
The Liverpool midfielder played the entire game as the South Americans left it late to secure victory.
Hernanes opened the scoring on 79 minutes shortly after Belgian defender Vincent Kompany received a second yellow card.
The Europeans went down to nine men on 88 minutes when Marouane Fellaini was dismissed by the Saudi Arabian official.
Meanwhile, Ryan Babel started and finished the game for Holland but was unable to inspire his country to victory over Nigeria, with both countries having to settle for a goalless stalemate.
The next round of fixtures is on Sunday when Brazil face New Zealand, Argentina play Australia and Holland meet the USA.
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