The players needed time to adapt to the match strategy of the great Xabi Alonso. And secondly, Osasuna played very badly defensively in this match.
Don't start with this again
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Real Madrid dominated the match. If we thought we would see several goals from Madrid. 71% of the ball possession was by Madrid players.
Which means Realmadrid had a good game , they weren't just lucky to have more than one goals or probably they need to work on some specific aspect . Osasuna on the other hand , isn't a small team and it's the first game of the season.. just like realmadrid, Athletico also dominated although still lost to their opponent at the end, it happens. Let's see what other games holds for them atleast next 5~10 games