This is quite simple. You dont even need xbox live friends for it.
In you MyCourt, press
to open the 'Play Games with Friends' menu. Scroll down to Strikeout and press
to invite players. Invite a player from your NBA team. Preferably, someone from the bottom of the list, so that they are easier to beat.
All you need to do now is win the game by scoring 3 times before your opponent does.