Andrew Suddath won the men's open singles race in the fifth annual Scullers' Head of the Potomac regatta yesterday on a 2 3/4-mile course along the Georgetown waterfront in 16:51.3. Dan Brisson of the New York Athletic Club was second in 17:16.0 and Bob Spousta of the Potomac Boat Club and the T.C. Williams rowing coach, was third in 17:28.6.

Unlike sweeps rowing where each oarsman pulls one oar, scullers simultaneously row two oars.

Head races, which are held in the fall, use a staggered start and are paced against the clock. The term "head" refers to the winner being proven best or head of that particular river or tributary.

In the masters singles race, the host Potomac Boat Club swept as Carl Anderson (18:58.4), Tim Baxter (19.38.3) and Allen Anderson (19.48.2) finished one-two-three. Glen Florio of the New York Athletic Club won the intermediate men's singles in 17:15.9 ahead of Douglas Burden (17:59.8) and Chris Walsh (18:01.6) of the Potomac Boat Club.

Townsend Swayze (PBC) won the men's seniors masters singles race in 18:58.5. The Vesper Boat Club of Philadelphia won the mixed eights competition in 15:02.9. Two Georgetown crews finished second and third. Woodbridge/Sullivan won the youth fours with coxswain in 16:52.9.