The newest game in town makes its debut tonight when the Washington Metros begin their first Eastern Basketball Association season at George Mason University in Fairfax. The opponent in the 8 p.m. contest is the Quincy (Mass.) Chiefs.

Joe Bonzano will coach Washington's representative in the EBA, whose slogan is "One Step from the Best," All 15 players on the Metro roster hope to someday impress a National Basketball Association scout.

Starting for Washington will be former Maryland center Tom Roy, with Towson State graduate Pat McKinley and Michael Davis of Bradley at the forwards, and playmaker John Bowie of Bowie State and Rubin Collins, formerly of Maryland-Eastern Shore, the guards.

Bonzano has pronounced his team in "pretty good" shape after 3 1/2 weeks of practice. His greatest concern is a lack of size up front.Roy, at 6-foot-9, is the second tallest player to reserve Bill Lynn, a wisp-thin 6-11.

Walter Luckett, a forward out of Ohio University; James Garvin of Phelps High and Boston College; Jerry Fort of Nebraska, and Marvin Stafford of Southern California are among the Chiefs' players.

The teams play by NBA rules with the exception of a three-point line 25 feet of each basket.