1940 U.S. National Championships – Men's singles

Men's singles
1940 U.S. National Championships
Champion Donald McNeill
Runner-up Bobby Riggs
Score4–6, 6–8, 6–3, 6–3, 7–5
Draw78
Seeds10

Donald McNeill defeated Bobby Riggs 4–6, 6–8, 6–3, 6–3, 7–5 in the final to win the men's singles tennis title at the 1940 U.S. National Championships.