1940 U.S. National Championships - Men's Singles
| Men's Singles | |
|---|---|
| 1940 U.S. National Championships | |
| Champion |
 Donald McNeill
|
| Runner-up |
Bobby Riggs
|
| Final score | 4–6, 6–8, 6–3, 6–3, 7–5 |
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.
The seeded players are listed below. Donald McNeill is the champion; others show the round in which they were eliminated.
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