The Potomac Valley AAU regional boys basketball championships were held recently at Potomac (Md.) High School. In the 17-and-under division, Reston defeated Rabeau, 74-68, for the title. But for the first time, both regional finalists in each division will advance to the AAU national playoffs. The 17-and-under championships are set for July 19-26 at Georgetown University's McDonough Gymnasium and both Reston and Rabeau will vie for national honors.

In the other division championship games, Kingman Boys and Girls Club defeated Allentown Boys Club, 38-32, in the 12-and-under; Vienna beat the Jaguars, 78-68, in the 13-and-under; Silver Hill defeated Lake Braddock, 70-51, in the 14-and-under; Silver Hill defeated Odam, 73-38, in the 15-and-under; and Reston got past Executive III, 86-76, in the 19-and-under division.

AAU girls regional finals are being played this week at several sites in Northern Virginia.

In the National Sports News Service final boys basketball rankings, Flint Hill, awarded a forfeit victory last March over Oak Hill Academy because of ineligible players (Oak Hill won the game, 58-57, in overtime), was ranked No. 2 with a 23-0 record. Top-ranked Camden (N.J.) finished 30-0.

Gonzaga point guard Rodney Holmes, whose outside shooting helped the Purple Knights to the Metro Conference title, including consecutive victories over DeMatha, has signed a grant-in-aid with Duquesne University.

Chris Conti, who led Bethesda-Chevy Chase to the Maryland state soccer playoffs and a 24-4-3 record the past two seasons, signed a grant in aid with Howard University. The 5-foot-9 1/2, 150-pound Conti, a striker, had seven goals and 10 assists for the Barons two years ago when the Barons won the Class AA state title two years ago. He had eight goals and five assists this year.

John Wood, who coached Spingarn's boys basketball team to a 31-0 record and the city championship in 1984-85, was named coach of the year for District II by the National High School Athletic Coaches Association.

Wood, who stepped down last year, will be honored at an awards banquet June 27 in Orlando, Florida. Others earning District II coach-of-the-year honors were Wilson's Eileen Covington for girls volleyball, H.D. Woodson's Bob Headen for girls basketball and H.D. Woodson's Clarence Washington for baseball . . .

Raymond (World) Smith, who at 6 feet 6 and 465 pounds attracted nationwide attention and may be the largest high school football player ever, has narrowed his college choices to Tennessee State, Norfolk State or Virginia State.

Smith played both offensive and defensive tackle. Despite his size and relative inexperience, he showed remarkable quickness and skill. He has been working with the weights and is trying to lose weight . . .

Bob Brown, one of the metropolitan area's top baseball coaches, will sponsor a baseball camp this summer at the Ellington Athletic Field in Northwest Washington. The camp is open to boys 10-14; there will be two two-week sessions beginning June 16 that will run from 9 a.m. to 3:30 p.m.

For further information, contact Brown at St. Albans.