Goals from Davy Arnaud and Kei Kamara handed the Wizards a 2-1 win over a youthful United side on Sunday.
Dimitar Berbatov's penalty was sandwiched between the two Kansas goals as United's impressive pre-season form ground to a halt.
In the aftermath of the results, the Wizards sold 700 season tickets for next year's MLS campaign.
Meanwhile, United officials have been forced to put 4,000 season tickets on general sales. Many fans decided not to renew their season tickets in protest at the Glazer's management of the club - though 50,000 have already been sold.
The news has raised questions over the alleged 'waiting list' of fans supposedly queuing up to buy season tickets; while supporters groups now await news on how well the clubs lucrative executive seat packages have sold.
A club spokesman shunned reports claiming the sales figures are bad news for the club, saying: "We are very happy with the way sales have gone and have already sold more season tickets than the capacity of 17 Premier League grounds."
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