Shinji Kagawa played the full 90 minutes of Japan's 4-0 friendly defeat to Brazil in Poland.
The United forward created an early chance for Kengo Nakamura with a one-two but Alberto Zaccheroni's side soon fell behind to a Paulinho strike.
Operating in an advanced role in the absence of an out-and-out striker, Kagawa watched on as Neymar converted a penalty and then made it 3-0 with his 16th international goal.
A neat pass by Sir Alex's summer signing saw Keisuke Honda felled by Adriano as he bore down on Diego Alves' goal but penalty appeals were waved away and, instead, Real Madrid's Kaka increased Brazil's lead.
Kagawa said on the eve of the match, after bagging the winner in another friendly in France, that his country's aim is to reach the quarter-finals of the World Cup in 2014 but the tournament hosts showed exactly why they are favourites to lift the trophy with this comprehensive success.