The D.C. National Bank Tennis Classic begins its qualifying rounds at 10:30 today at the Rock Creek Tennis Stadium at 16th and Kennedy Streets NW. Sixty-four players will be attempting to qualify for the eight remaining spots in the tournament.

Qualifying will conclude Sunday at noon. The 64-man draw, which consists of 51 automatic qualifiers, five "wild cards" and the eight weekend survivors, starts Monday at noon.

The field of qualifiers will not be decided until today's 9 a.m. check-in time when tournament officials will take the first 64 players on the ATP computer who are able to attend.

Among those competing are Australia's Wally Masur, who at 102 on the computer would have been able to skip the qualifying round if he had entered in time; Claude England, recent winner of the Mid-Atlantic Tennis Championships; Nels Van Patten, brother of pro Vince and son of actor Dick, and Washington's Joe Ragland.

Also trying to qualify are members of the 1982 Junior Davis Cup Team. Among those eight players are Mike Leach of the University of Michigan, the current NCAA singles champion, and Marcel Freeman, a four-time all-America from UCLA.

Drew Gitlin, who took eventual champion Jimmy Connors to four sets at Wimbledon last month, withdrew Thursday from the qualifying round.