You can count on waiting 15-30 minutes at L'Enfant after the game to switch from Green to Orange.
...the one small mercy is that since it's a mid-week match at least they shouldn't have any major track-work going on at the time (I emphasise SHOULDN'T - they haven't posted anything on the site, and the Orange line is a prime location for this with that Silver line project going in between East and West Falls Church).