MAJOR LEAGUE soccer: D.C. United will play two home matches at alternative locations — most likely in Maryland — and about a dozen away games before Audi Field opens this summer. MLS is tentatively planning to announce the complete 2018 schedule today. Before the holidays, the league unveiled all 23 home openers, including United vs. Houston Dynamo on March 17 at a venue to be determined. The other D.C. home date this spring, league sources said, will be April 14 against the Columbus Crew. United are in the process of finalizing both venues, which are subject to the league's approval, and will announce them in the coming weeks. According to sources, Maryland SoccerPlex in Montgomery County (5,200 capacity) is the front-runner for the first home match and Navy-Marine Corps Memorial Stadium in Annapolis (34,000) is the favorite for the second game.