Kylian Mbappe scored twice as Real Madrid continued his perfect start to the La Liga season with Oviedo's victory.
Mbappe was the only goal against Osasuna, who scored three games from two games as he hit five minutes for the first eight minutes before halftime, finished the game from the edge of the box before kicking home for the second time.
Meanwhile, Trent Alexander-Arnold became one of the alternatives to the game after the last game started, with owner Xabi Alonso picking Dani Carvajal instead of right-back.
The England international played in the last three minutes of the game, when Real rose 2-0.
Vinicius Jr, who also started on the bench, added a third of the downtime in a clinical strike.
Alonso started the offense with 18-year-old Franco Mastanuono, who impressed the teenager with his performance.
Oviedo's best chance was in the 81st minute, when Kwasi Sibo's ranged effort hit the outside of the outpost before Mbappe secured his second victory.
The victory means real rivals Barcelona and Villarreal scored six points after two matches.