The Sox swept the Nationals in their last visit to D.C. in 2010 .
Until 2013 , April was the only baseball month when Sox never faced NL teams along with all other AL teams .
The Sox swept the Nationals in Sox 's last visit to D.C. in 2010 .
Until 2013 , April was the only baseball month when Sox never faced NL teams along with all other AL teams .