Defending champion William Larned defeated William Clothier in the Challenge Round 6–1, 6–2, 5–7, 1–6, 6–1 to win the men's singles tennis title at the 1909 U.S. National Championships. Clothier defeated Maurice McLoughlin in the All Comers' Final.

The event was held at the Newport Casino in Newport, R.I. in the United States. There were more than 128 players in the draw.

Challenge round

All Comers' finals

Earlier rounds 1st round - H. Simmons d. W. Jones w/o R. Gaunt d. W. Manice 6–1,6–3,6–0 G. Adee d. C. Woodward w/o R. Stevens d. G. Brooke w/o H. Powell d. J. Darragh 6–3,4–6,6–4,6–3 H. Martin d. W. Connell 6–0,6–3,8–6 W. Cragin d. W. Finley 6–0,6–0,6–1 I. Thomas d. R. McCloud 3–6,6–4,6–1,6–4 S. Cutting d. A. Cassils 6–2,6–2,6–4 G. Hobbs d. G. Hinckley d. C. Gardner w/o E. Taylor d. C. Porter 4–6,6–2,6–4,6–3 N. Niles d. S. Beals w/o A. Reggio d. C. Hobart w/o A. Neargaard d. J. Jones w/o J. Snow d. A. Thacher w/o S. Millett d. G. Wagner w/o T. Pell d. D. Mathey 6–2,6–4,6–2 G. Janes d. J. Williams 6–1,6–0,6–2 G. Gardner d. W. Keene w/o P. Hawk d. C. Pell 1–6,6–0,17–15,9–7 F. Colston d. J. Ames 7–5,3–6,1–6,7–5,6–3 E. Donn d. S. Merrihew w/o W. Johnson d. A. Winsor 6–2,6–0,6–0 O. Hinck d. W. Pate 6–2,6–1,6–1 S. Bain d. E. Torrey 8–6,3–6,6–4,1–6,6–2 W. Roberts d. L. Grant 6–3,6–0,6–1 W. Grant d. R. Terry w/o E. Larned d. G. Rushmore w/o D. Dilworth d. C. Hale w/o T. Slidell d. W. Stewart w/o C. Johnston d. R. LeRoy w/o R. Palmer d. C. Watson w/o H. Pell d. H. Tallant w/o B. Rives d. P. Randolph w/o R. Hazard d. A. Peterson w/o

2nd round - K. Behr d. W. Bourne 6–2,6–0,6–1 N. Wadsworth d. F. Soule 6–0,6–2,6–2 N. Vose d. H. Alexander w/o C. Sands d. T. Blumer w/o H. Slocum d. G. Thompson w/o N. Peebles d. C. Runyan w/o F. Hughes d. G. Parrish w/o W. Clothier d. A. Dabney w/o C. Cooke d. W. Grosvenor 6–1,6–0,6–2 E. Sheppard d. J. DuBarry 6–2,6–1,6–0 P. Fosdick d. H. Kirkover w/o H. Scott d. F. Thomas 6–2,6–2,6–0 E. Whitney d. S. Sinsabaugh 7–5,6–2,6–1 W. Rosenbaum d. R. Oakley w/o H. MacKinney d. F. Paul 8–6,7–5,6–3 G. Groesbeck d. H. Stiness w/o S. Henshaw d. E. Frank 6–0,6–1,6–2 E. Leo d. G. Knowlton 6–2,7–5,6–3 T. Bundy d. W. Bennett 6–1,6–3,6–1 G. Church d. E. Gould 7–5,6–1,6–3 G. Smith d. S. Johnson 4–6,6–3,3–6,6–3,6–2 N. Johnson d. G. Douglas w/o H. Ballou d. E. Cross w/o R. Gaunt d. H. Simmons 4–6,8–6,6–0,2–6,6–3 R. Stevens d. G. Adee 3–6,6–2,9–7,6–1 H. Martin d. H. Powell 6–3,6–2,6–4 W. Cragin d. I. Thomas 6–0,6–0,6–0 S. Cutting d. G. Hobbs 6–1,6–0,6–0 G. Hinckley d. E. Taylor 7–5,6–2,3–6,4–6,6–2 N. Niles d. A. Reggio 6–3,6–3,6–1 A. Neargaard d. J. Snow w/o T. Pell d. S. Millett w/o G. Gardner d. G. Janes 8–6,1–6,1–6,7–5,8–6 F. Colston d. P. Hawk 6–3,6–4,6–4 W. Johnson d. E. Donn 6–0,6–1,6–1 O. Hinck d. S. Bain 6–2,6–1,6–3 W. Grant d. W. Roberts 6–2,5–7,6–1,6–1 E. Larned d. D. Dilworth w/o T. Slidell d. C. Johnston 6–3,12-10,4–6,3–6,6–4 R. Palmer d. H. Pell 6–1,6–0,6–2 R. Hazard d. B. Rives 6–2,6–3,6–4 M. McLoughlin d. J. Willis 6–1,6–2,6–2 M. Long d. F. Harris 6–1,6–4,6–4 T. Trask d. C. Mills 6–0,6–2,6–0 C. Bull d. G. Dionne 6–2,6–1,3–6,6–0 J. Seabury d. G. Pike 4–6,7–5,6–4,6–0 R. Thomas d. G. Hollister w/o A. Stillman d. L. Wallis 8–10,6–1,10–8,6–4 R. Seaver d. J. Neely 6–0,6–4,6–4 F. Inman d. F. Williams w/o C. Plimpton d. W. Patten w/o A. Gammell d. R. Bishop w/o C. King d. T. Potter 2–6,6–4,6–4,6–4 E. Stille d. G. Phelps w/o C. Rogers d. J. Kopf 6–1,6–4,6–3 F. Burnham d. D. Woodward 6–3,6–3,6–0 F. Sulloway d. G. Beals 6–3,6–4,6–1 A. Baker d. G. McFadden w/o R. Gambrill d. G. Keeler 6–0,6–0,6–0 G. Touchard d. D. Meyer w/o C. Runyan d. P. Martin w/o S. Pendergast d. S. French 6–1,6–0,6–0 B. Wagenr d. S. H. Boshell 6–3,6–1,6–2 B. Colie d. G. Leamy w/o

3rd round - K. Behr d. N. Wadsworth 6–4,1–6,6–2,6–1 C. Sands d. N. Vose 6–1,6–2,6–4 H. Slocum d. N. Peebles 6–3,3–6,7–5,6–3 W. Clothier d. F. Hughes w/o C. Cooke d. E. Sheppard 6–0,6–0,7–5 H. Scott d. P. Fosdick 7–5,7–5,7–5 E. Whitney d. W. Rosenbaum w/o H. MacKinney d. G. Groesbeck 6–2,8–6,6–2 S. Henshaw d. E. Leo 7–5,3–6,6–4,6–3 T. Bundy d. G. Church 4–6,6–1,7–5,6–3 N. Johnaon d. G. Smith 6–4,6–8,6–3,6–2 R. Gaunt d. H. Ballou 6–2,6–4,6–1 R. Stevens d. H. Martin w/o W. Cragin d. S. Cutting 9–7,6–4,6–4 N. Niles d. G. Hinckley w/o T. Pell d. A. Neargaard 6–2,6–2,6–1 F. Colston d. G. Gardner 6–2,3–6,6–1,7–5 W. Johnson d. G. Hinck 6–1,6–4,6–1 E. Larned d. W. Grant 6–2,6–0,6–4 R. Palmer d. T. Slidell 6–4,6–2,6–3 M. McLoughlin d. R. Hazard 6–3,6–1,6–1 M. Long d. T. Trask 6–3,6–4,6–0 C. Bull d. J. Seabury 2–6,6–2,6–2,6–4 A. Stillman d. R. Thomas 6–2,6–1,7–5 F. Inman d. R. Seaver 6–3,7–5,6–4 C. Plimpton d. A. Gammell 6–0,6–4,6–4 E. Stille d. C. King 6–1,6–3,3-3 rtd. C. Rogers d. F. Burnham w/o F. Sulloway d. A. Baker 6–2,6–1,6–2 G. Touchard d. R. Gambrill 6–0,6–0,6–4 S. Pendergast d. C. Runyan 6–0,6–0,6–3 B. Wagner d. B. Colie 6–0,6–1,6–1

4th round - K. Behr d. C. Sands w/o W. Clothier d. H. Slocum 8–6,6–3,6–4 H. Scott d. C. Cooke E. Whitney d. H. MacKinney 5–7,6–2,6–0,8–6 T. Bundy d. S. Henshaw 6–2,6–3,6–1 N. Johnson d. R. Gaunt 5–7,–64,6–3,6–1 W. Cragin d. R. Stevens 3–6,6–0,6–2,6–3 T. Pell d. N. Niles 3–6,6–4,3–6,6–4,8–6 F. Colston d. W. Johnson 3–6,6–4,6–3,1–6,6–3 R. Palmer d. E. Larned 5–7,6–4,6–2,6–1 M. McLoughlin d. M. Long 7–5,6–2,5–7,2–6,10–8 C. Bull d. A. Stillman 8–10,5–7,6–0,6–1,6–4 F. Inman d. C. Plimpton 6–4,6–4,6–3 C. Rogers d. E. Stille 6–0,7–5,6–0 G. Touchard d. F. Sulloway 6–3,4–6,6–4,6–4 B. Wagner d. S. Pendergast 6–4,4–6,6–2,9–7

5th round - W. Clothier d. K. Behr 2–6,6–2,6–3,6–4 E. Whitney d. H. Scott 5–7,6–0,6–2,6–3 T. Bundy d. N. Johnson 6–0,6–0,6–1 W. Cragin d. T. Pell 2–6,6–2,6–4,6–3 R. Palmer d. F. Colston 0–6,6–4,6–1,5–7,6–4 M. McLoughlin d. C. Bull 6–4,6–4,6–2 F. Inman d. C. Rogers 6–4,6–2,6–2 G. Touchard d. B. Wagner 6–3,6–2,10–8

References