1946 U.S. National Championships – Men's singles

Jack Kramer defeated Tom Brown 9–7, 6–3, 6–0 in the final to win the men's singles tennis title at the 1946 U.S. National Championships.

Seeds
The seeded players are listed below. Jack Kramer is the champion; others show the round in which they were eliminated.


 * 1) 🇺🇸 Frank Parker (quarterfinals)
 * 2) 🇫🇷 Yvon Petra (second round)
 * 3) 🇺🇸 Jack Kramer (champion)
 * 4) 🇦🇷 Alejo Russell (fourth round)
 * 5) 🇺🇸 Gardnar Mulloy (semifinals)
 * 6) 🇫🇷 Pierre Pellizza (fourth round)
 * 7) 🇺🇸 Bill Talbert (quarterfinals)
 * 8)  Felicisimo Ampon (third round)
 * 9) 🇺🇸 Donald McNeill (quarterfinals)
 * 10) 🇦🇷 Enrique Morea (first round)
 * 11) 🇺🇸 Tom Brown (finalist)
 * 12) 🇦🇺 Harry Hopman (second round)
 * 13) 🇪🇨 Pancho Segura (quarterfinals)
 * 14) 🇫🇷 Bernard Destremau (first round)
 * 15) 🇺🇸 Robert Falkenburg (semifinals)
 * 16) 🇧🇪 Philippe Washer (second round)
 * 17) 🇺🇸 Seymour Greenberg (fourth round)
 * 18) 🇦🇺 Robert Barnes (third round)
 * 19) 🇺🇸 Frank Guernsey (third round)
 * 20) 🇬🇧 Derrick Barton (third round)

Key

 * Q = Qualifier
 * WC = Wild card
 * LL = Lucky loser
 * r = Retired