FOUR UNBEATENS REMAIN: Heading into the final month of the regular season, only two boys and two girls high school basketball teams remain unbeaten.

Top-ranked DeMatha is 20-0 entering its big Metro Conference game Tuesday at St. John's. The Stags have had two close calls lately, holding off St. John's, 69-65, in overtime, and, Friday night, nipping Good Counsel, 58-57. Blair, which has not been seriously challenged in the Montgomery 4A league, is 17-0 after winning two games last week by 21 and 27 points. Georgetown Prep (13-1) suffered its first loss at Good Counsel yesterday.

The last two unbeaten girl teams are top-ranked Madison (15-0) and Bullis (19-0). Led by Jackie Freeman, Madison already has beaten No. 2 West Springfield, 79-55.

Bullis, the surprise winner of the Blair Christmas tournament, took a giant step toward winning the Independent School League Division A championship with its 54-45 victory over St. Agnes Friday. EAGLES' WINGS CLIPPED: High Point had won 64 of its last 70 games, including 49 of its last 50 league games, coming into last week. However, the high-scoring Eagles suffered a rare home loss to Parkdale, 98-83, Tuesday and were edged at Crossland, 68-67, Friday. The two-time league champions don't start a player over 6 feet 3 and Coach Ernie Welch's philosophy is to run throughout the game, wear down opponents and use the perimeter shooting of Wayne Bristol and Rawle White. But Parkdale and Crossland also have been successful on the run and both teams have some height. Hence, back-to-back losses for High Point for the first time since January 1988. DUAL SPARTANS SUCCESS: Senior Jamie Warren said a major reason the West Springfield boys and girls teams are both enjoying excellent seasons is because of their friendly competition. Warren, the leading scorer and rebounder and son of Coach Jim Warren, has led the Spartans (13-2 overall, 6-1 in the Virginia AAA Northern District) to their finest start in almost 20 years. Coach Bill Gibson's girls team (14-1, 7-0) is led by 6-1 junior guard Julie Wight and Jen Terry.

"Yes, we talk about these games a lot," Jamie Warren said. The girls "have all this height and we have none. We tell them we play better defense and we shoot better." SOUTH LAKES STUNNED: South Lakes was an impressive 14-1 overall and had extended its Virginia AAA Great Falls District winning streak to 28 games in its first season of the post-Grant Hill era. But Friday, Chantilly, which lost at home to South Lakes by 84-71 seven games ago, stunned the hosts, 83-81, to gain a tie for first place.

Chantilly handled the Seahawks' press, overcame a decided height disadvantage and withstood a barrage of three-point field goals by South Lakes guard Howard Hogan (made eight, finished with 28 points).

Chantilly's Tim Fudd scored 27 points, including a pair of free throws that turned out to be the winning points. "We needed that balance to win the game," said Chantilly Coach Mark Martino.