Already out of the running in the International Champions Cup after defeats to Inter Milan and Roma, Carlo Ancelotti fielded another experimental side as Los Blancos continue their preparations for the 2014-15 season.
In Ann Arbor, however, Real Madrid were well off the pace set by Louis van Gaal's men.
Capping off a sublime move forward, Ashley Young put United ahead after 21 minutes by beating Iker Casillas with a strong strike into the bottom-left corner.
Just six minutes later, Gareth Bale drew a penalty for Ancelotti's men, levelling the game himself with a calmly taken kick from the spot. But that was as bright as it got for the European champions.
In the 37th minute, Young registered his second goal of the afternoon when a cross to Wayne Rooney found its way into the back of the net, while Javier Hernandez added the finishing touch with a cool headed finish late on to seal the result.
Across the following slides, we examine what Ancelotti will have learned from Real Madrid's encounter with Manchester United on Saturday.