Robert Spousta of Potomac Boat Club scored his second victory in two days in winning the masters single race in the Independence Day Regatta today on the Schuylkill River.

Spousta covered the 1,000-meter course in 3:55.3 against a stiff headwind on smooth water. He won the race by 2 1/2 lengths over Mike Hindery of Philadelphia's Fairmount Rowing Association. Spousta had won the qualifying heat Saturday in 4:03.7.

Kevin Bedell of the Potomac Boat Club rowed to the third-place medal in the intermediate single in 8:05.7, finishing 1 1/2 lengths behind the winner, Bob D'Italia of Philadelphia's Vesper Boat Club.

Steve Weiss of the Potomac Boat Club finished fourth in the intermediate lightweight single in 8:20.0. The winner of the 2,000-meter race was Al Cress of the New York Athletic Club in 8:12.3.

The Potomac Boat Club crew came in fourth in the intermediate four-with-coxswain in 7:35.2 for 2,000 meters. Undine Boat Club of Philadelphia won in 7:27.8.

Potomac Boat Club finished second in the junior pair-without-coxswain. It trailed the Back Bay Viking Rowing Club of Atlantic City, N.J., by less than one-half length. Back Bay Viking rowed the 1,500 course in 5:36.0, Potomac in 5:37.7. A second Potomac boat was disqualified for colliding under the first bridge with the Undine shell, which capsized. Undine finished third after the race was restarted.

Dave Gantz of Potomac Boat Club finished third in the C division of the masters single with a time of 4:12.4 for 1,000 meters. A Potomac boat caught two crabs on the home stretch in the junior four-with-coxswain race and finished fifth in 5:52.1 for 1,500 meters. The Hanalan Crew of Toronto was the victor in 5:11.5.

Ed Carlton and Carl Swayze of Potomac Boat Club took second place in the masters double with a time of 3:45.5 for 1,000 meters. Fairmount Rowing Association won in 3:36.7.