Michelle Griglione set her fifth and sixth Potomac Valley Open records at the Junior Olympic Swimming Championships last night, winning the 13-14 girls 100-yard butterfly and the 100-yard backstroke at the White Oak (Md.) Swim Center.

Griglione was timed in 57:59 in the butterfly and in 58:93 in the backstroke, breaking in that race the record she had set in the preliminaries. She also won the 50-yard freestyle in 24.31.

Griglione, 13, of Northern Virginia Fun Fitness, had set records in the 200 butterfly, the 200 individual medley and the 100 backstroke preliminaries and was a member of two record-setting relay teams during the two-day championships.

Griglione, Christine Smith, Gretchen Wasserman and Ingrid Hagen set their second relay record, winning the 200-yard medley relay in 1:58.70. The quartet won the 200-yard freestyle relay in record time on Friday.

After 80 events, with 16 remaining, Rockville led the combined team scoring with 5,426 points. Curl was second with 4,283, followed by Solotar with 2,500, the Bowie Bulldogs with 1,836 and Starlit with 1,537.

Bowie's Jane McCabe and David Streight won the 13-14 girls and boys 1,000-yard freestyles. McCabe won the 40-length swim of the 25-yard pool in 10:44.54, with Alisa Hess of Allentown Road Aquatic Club second with 11:04.09 and Gretchen Green of Rockville finished third in 11:06.19.

Streight won the next race by 15 yards over Frank DeSando of Rockville. Streight finished with a 10:22.82 to Desando's 10:31.89. Lunn Lestina of Curl Swim Club was third in 10:32.34.

In the 15-18 200-yard breaststroke, Tim Tuchler of Curl touched out Jon Ballard of Solotar at the finish to win in 2:12.13. Ballard finished second in 2:12.82 and Tom Robl of Solotar was third with 2:14.90. In the girls version, Beth Spector of Rockville won easily in 2:25.24 ahead of Lisa Herring of Solotar in 2:30.58. Lani Nelson of Starlit was third with 2:32.57.

In another close 15-18 boys race, Dan Veatch of Rockville edged Alan Greenwood of NVFF to win the 500-yard freestyle. Veatch touched in 4:41.42 with Greenwood right behind in 4:41.71. Steve Williams of Rockville was third in 4:43.96.