The Starlit Aquatic Club dominated the first night of the Potomac Valley AAU Senior Swimming Championships, scoring nearly 500 more points than its nearest competitor, the Rockville Municipal Swim Club, in its home pool last night.

Competition continues Sunday evening, with Starlit leading at this point, 1,794-1,275, over Rockville.

Starlit's men's 400-meter freestyle relay team of Clay Britt, Phil Perdue, Trent Lyght and Jim Alexander was unbeatable, with the four national qualifiers clocking 3:41.22. Britt, who swam the anchor leg, is 16th in the current world standings in the 100-meter backstroke.

Starlit's Kevin Gover barely outstretched teammate Keith Patterson in the 100-meter breaststroke, winning in 1:11.67.

David Alleva of Starlit edged Rockville's Andy Martin by .49 seconds in the 200-meter butterfly with a time of 2:13.57.

The Rapp sisters -- Betsy (19), Jenny (16) and Susan (14) -- added points for Starlit. Betsy won the 200-meter butterfly in 2:19.29, Susan took the 100-meter breaststroke in 1:17.86 and Jenny was third in the 100-meter freestyle.

Rockville's Grace Whiteis swam a strong 1:00.17 in the 100-meter freestyle to beat teammate Jude DeSando by .54 seconds.