Michelle Griglione, 14, of Northern Virginia Fun and Fitness won two events and set three Potomac Valley Swim Committee open records yesterday during the first day of the Junior Olympic championships at the Colesville-White Oak Swim Center in Silver Spring.

Griglione broke her own mark in the 200-yard individual medley she set in the preliminaries, winning the event in 2:09.10. Devon Hyde of Arlington Aquatics was second in 2:14.09 and Lisa Ferris was third, at 2:14.90.

Griglione scratched from the 200-yard butterfly final after setting a PVSC record of 2:08.56 in the preliminaries. The extra rest helped later in the evening when she won the 100-meter freestyle in senior national qualifying time of 52.24.

Northern Virginia Fun and Fitness teammates Christi Smith, Gretchen Wasserman and Ingrid Hagen joined Griglione to set another PVSC record, winning the 200-yard freestyle relay in 1:39.6. Curl Swim Team was second in 1:40.23, followed by Rockville in 1:44.89.

Starlit Aquatic Club won the girls and boys 15-18 200-yard freestyle relays. Beth Stohsahl, Loni Nelson, Kathy Dobberman and Mary Monahan finished in 1:40.99, ahead of Rockville "C" at 1:42.05 and Solotar at 1:42.35. Mark Van Ryne, John Cann, T.A. DeBiase and David Roach led the Starlit boys to victory in 1:30.13. Rockville "A" was second in 1:31.13 and Rockville "B" third in 1:31.42.

In the boys 15-18 1,000-yard freestyle, Allan Greenwood of Northern Virginia Fun and Fitness won in 9:44.46. Second was Mark Promersberger of Solotar in 10:01.92, with Mark Goch of Rockville third in 10:02.54.

Lisa Faris, swimming unattached, won the 500-yard freestyle in the 13-14 girls in 5:10.62. Jane MaCabe of the Bowie State Bulldogs was second in 5:15.73 and Kim Hughes of Curl was third in 5:17.89.